CCNT1 cyclin T1 [Homo sapiens (human)] - Gene

Summary

Official Symbol: CCNT1provided by HGNC
Official Full Name: cyclin T1provided by HGNC
Primary source: HGNC:HGNC:1599
See related: Ensembl:ENSG00000129315 MIM:143055; AllianceGenome:HGNC:1599
Gene type: protein coding
RefSeq status: REVIEWED
Organism: Homo sapiens
Lineage: Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo
Also known as: CCNT; CYCT1; HIVE1
Summary: This gene encodes a member of the highly conserved cyclin C subfamily. The encoded protein tightly associates with cyclin-dependent kinase 9, and is a major subunit of positive transcription elongation factor b (p-TEFb). In humans, there are multiple forms of positive transcription elongation factor b, which may include one of several different cyclins along with cyclin-dependent kinase 9. The complex containing the encoded cyclin and cyclin-dependent kinase 9 acts as a cofactor of human immunodeficiency virus type 1 (HIV-1) Tat protein, and is both necessary and sufficient for full activation of viral transcription. This cyclin and its kinase partner are also involved in triggering transcript elongation through phosphorylation of the carboxy-terminal domain of the largest RNA polymerase II subunit. Overexpression of this gene is implicated in tumor growth. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Apr 2013]
Expression: Ubiquitous expression in bone marrow (RPKM 11.5), testis (RPKM 9.4) and 25 other tissues See more
Orthologs: mouse all
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Genomic context

Location:: 12q13.11-q13.12

Exon count:: 11

Annotation release	Status	Assembly	Chr	Location
RS_2024_08	current	GRCh38.p14 (GCF_000001405.40)	12	NC_000012.12 (48688458..48716707, complement)
RS_2024_08	current	T2T-CHM13v2.0 (GCF_009914755.1)	12	NC_060936.1 (48650484..48678733, complement)
RS_2024_09	previous assembly	GRCh37.p13 (GCF_000001405.25)	12	NC_000012.11 (49082241..49110490, complement)

Chromosome 12 - NC_000012.12 Genomic Context describing neighboring genes

Genomic regions, transcripts, and products

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Genomic Sequence:

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Expression

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See details

Project title: HPA RNA-seq normal tissues
Description: RNA-seq was performed of tissue samples from 95 human individuals representing 27 different tissues in order to determine tissue-specificity of all protein-coding genes
BioProject: PRJEB4337
Publication: PMID 24309898
Analysis date: Wed Apr 4 07:08:55 2018

Bibliography

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GeneRIFs: Gene References Into Functions

What's a GeneRIF?

A Truncated Isoform of Cyclin T1 Could Contribute to the Non-Permissive HIV-1 Phenotype of U937 Promonocytic Cells.
Title: A Truncated Isoform of Cyclin T1 Could Contribute to the Non-Permissive HIV-1 Phenotype of U937 Promonocytic Cells.
A CRISPR Screen of HIV Dependency Factors Reveals That CCNT1 Is Non-Essential in T Cells but Required for HIV-1 Reactivation from Latency.
Title: A CRISPR Screen of HIV Dependency Factors Reveals That CCNT1 Is Non-Essential in T Cells but Required for HIV-1 Reactivation from Latency.
Genome-wide association study of word reading: Overlap with risk genes for neurodevelopmental disorders.
Title: Genome-wide association study of word reading: Overlap with risk genes for neurodevelopmental disorders.
CDK9/Cyclin T1 kinase is a protein kinase, indirectly involved in the cell cycle progression.
Title: Ligand- and structure-based pharmacophore modeling, docking study reveals 2-[[4-[6-(isopropylamino) pyrimidin-4-yl]-1H-pyrrolo[2,3-b] pyridin-6-yl] amino] ethanol as a potential anticancer agent of CDK9/cyclin T1 kinase.
Cyclins B1, T1, and H differ in their molecular mode of interaction with cytomegalovirus protein kinase pUL97.
Title: Cyclins B1, T1, and H differ in their molecular mode of interaction with cytomegalovirus protein kinase pUL97.
CycT1 is most highly upregulated in maximally activated memory CD4 T cells as expected, but may become less associated with T cell activation during HIV replication.
Title: Regulation of cyclin T1 during HIV replication and latency establishment in human memory CD4 T cells.
ASF/SF2 is identified as a splicing regulator of cyclin T1, which contributes to the control of the subsequent transcription events.
Title: Regulation of the Alternative Splicing and Function of Cyclin T1 by the Serine-Arginine-Rich Protein ASF/SF2.
The TAR central loop contacts the CycT1 Tat-TAR recognition motif (TRM) and the second Tat Zn(2+)-binding loop. Hydrogen-deuterium exchange (HDX) shows that AFF4 helix 2 is stabilized in the TAR complex despite not touching the RNA, explaining how it enhances TAR binding to the SEC 50-fold.
Title: Insights into HIV-1 proviral transcription from integrative structure and dynamics of the Tat:AFF4:P-TEFb:TAR complex.
Quantitative measurement of the molecular interactions among Tat, CycT1 and CDK9 has showed that any third molecule enhances the binding between the other two molecules. These findings suggest that each component of the Tat:P-TEFb complex stabilizes the overall complex, thereby supporting the efficient transcriptional elongation during viral RNA synthesis.
Title: Quantification of the HIV transcriptional activator complex in live cells by image-based protein-protein interaction analysis.
the introduction of HIV-1 Tat and Mg12+ ion resulted in the active site architectural characteristics of phosphorylated CDK9/cyclin T1 complex
Title: Determining the Functions of HIV-1 Tat and a Second Magnesium Ion in the CDK9/Cyclin T1 Complex: A Molecular Dynamics Simulation Study.

Submit: New GeneRIF Correction See all GeneRIFs (79)

Phenotypes

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Review eQTL and phenotype association data in this region using PheGenI

EBI GWAS Catalog

Description
Clozapine-induced agranulocytosis is associated with rare HLA-DQB1 and HLA-B alleles. EBI GWAS Catalog EBI GWAS CatalogPubMed

Variation

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See variants in ClinVar

See studies and variants in dbVar

See Variation Viewer (GRCh37.p13)

See Variation Viewer (GRCh38)

HIV-1 interactions

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Replication interactions

Interaction	Pubs
HIV transcription is restricted by the dissociation of a functional P-TEFb complex (CCNT1-CDK9) caused by PPP1R10 (PNUTS)	PubMed
HIV-1 infection increases CCNT1 (Cyclin T1) expression in monocyte derived macrophages	PubMed
Knockdown of cyclin T1 (CCNT1) by siRNA inhibits HIV-1 replication in HeLa-derived TZM-bl cells	PubMed
Knockdown of cyclin T1 (CCNT1) by siRNA inhibits HIV-1 replication in HeLa P4/R5 cells	PubMed

Protein interactions

Protein	Gene	Interaction	Pubs
Pr55(Gag)	gag	CCNT1 isoform b inhibits HIV-1 RT activity in the media and HIV-1 Gag protein expression in the cell lysate in a dose-dependent manner	PubMed
	gag	Expression of CycT1 increases Gag production 20-50 fold in rat T cells. Expression of both CRM1 and CycT1 factors synergistically enhances Gag production to levels approximately 10-40% of those detected in human cells	PubMed
Tat	tat	HIV-1 Tat binds to CDK9 and CCNT1 (CycT1) in an additive manner as shown through Fluoppi (fluorescent-based technology detecting protein-protein interactions)	PubMed
	tat	The N-terminus (amino acids 1-48, including activation domain) of HIV-1 Tat binds to P-TEFb through a direct interaction with the N-terminus (amino acids 1-290) of cyclin T1 during Tat-mediated transactivation of the HIV-1 LTR promoter	PubMed
	tat	Cyclin T1 mutant N60A fails to bind to HIV-1 Tat and impairs the effect on Tat-mediated transactivation, but H183A mutant exhibits Tat-binding activity and partially disrupts Tat-mediated transactivation	PubMed
	tat	PKR-mediated Tat phosphorylation inhibits Tat nuclear localization, and disrupts Tat binding to HIV-1 TAR RNA and interaction with cyclin T1 in HeLa cells	PubMed
	tat	A La-related protein, LARP7, is associated with P-TEFb, HEXIM1/2, MEPCE, and 7SK RNA in a large stable complex form. Knockdown of LARP7 decreases the steady-state level of 7SK, but increases free P-TEFb and enhances Tat-mediated transcription	PubMed
	tat	Amino acids Q46, Q50 and F176 of human CycT1 protein are involved in its binding to HIV-1 Tat. A triple-mutant containing Q46A, Q50A and F176A mutations in CycT1 completely abolishes the transcriptional activity	PubMed
	tat	HIV-1 Tat recruits P-TEFb to the HIV-1 Transcription Activation Response (TAR) RNA during Tat-mediated transactivation of the HIV-1 LTR promoter	PubMed
	tat	P-TEFb interacts with HIV-1 Tat as part of both the HIV-1 transcription preinitiation and elongation complexes	PubMed
	tat	Cyclin T1 (CCNT1) is identified to interact with HIV-1 Tat mutant Nullbasic in HeLa cells by LC MS/MS	PubMed
	tat	A homogeneous assay in AlphaLISA indicates that the affinity between HIV-1 Tat and pTEFb is determined to be approximately 20pM, and only 7% of purified Tat is found to be active in forming tertiary complex with pTEFb	PubMed
	tat	Cyclin T1 V107E mutant that exhibits no binding to CDK9 or HEXIM1 has weak interaction with HIV-1 Tat, and inhibits Tat-mediated transactivation in human cells	PubMed
	tat	Cyclin T1 N60K mutant that binds weakly with CDK9, but not with HEXIM1 and AFF4, has weak interaction with HIV-1 Tat and inhibits Tat-mediated transactivation in human cells	PubMed
	tat	Cyclin T1 Y175E and Y175S mutants exhibit no binding to HEXIM1 and HIV-1 Tat, leading to impair Tat-dependent transactivation of HIV LTR	PubMed
	tat	CDK9-CycT1-AFF1 is stimulated by HIV-1 Tat and transferred as a single complex unit to BRD4 upon stress-induced disruption of AFF1-containing 7SK snRNP (HEMX1, MEPCE, LARP7, 7SK RNA, CDK9, CycT1, and AFF1)	PubMed
	tat	AFF1 enhances the affinity of HIV-1 Tat for CycT1, which competitively dissociates HEXIM1 and is responsible for AFF1's promotion of Tat's extraction of CDK9/CycT1 from 7SK snRNP	PubMed
	tat	Brd4 inhibits HIV-1 Tat-human super elongation complex (components AFF4, ELL2, CycT1, and CDK9) by competing with HIV-1 Tat for binding to P-TEFb on HIV-1 promoter	PubMed
	tat	TAR binds Tat and P-TEFb as it emerges on the nascent transcript, competitively displacing the inhibitory 7SK snRNP (HEXIM1 and LARP7) and activating the P-TEFb kinase	PubMed
	tat	HIV-1 Tat displaces HEXIM1 from Cyclin T1 in the context of the native 7SK snRNP by interacting with the Cyclin T1-binding domain (amino acid 255-359) of HEXIM1	PubMed
	tat	The interaction of HIV-1 Tat with HIV-1 Transcription Activation Response (TAR) RNA is enhanced by the interaction of Tat with P-TEFb, and TAR RNA also enhances the interaction between Tat and cyclin T1	PubMed
	tat	During HIV-1 Tat mediated transactivation of the HIV-1 LTR promoter, Tat stimulates the phosphorylation of the C-terminal domain (CTD) of RNA polymerase II by P-TEFb, leading to transcription elongation	PubMed
	tat	ZASC1, a cellular transcription factor, interacts with HIV-1 Tat and cellular proteins CDK9/Cyclin T1 (P-TEFb) in a TAR-independent manner, suggesting that the Tat/P-TEFb complex in the transcriptional elongation site is promoted by ZASC1	PubMed
	tat	Binding of isolated AFF1(1-308) CBS to CDK9/CycT1 prevents HIV-1 Tat from activating HIV transcription and assembling complete SECs (AFF1, AFF4, ELL2, and ENL). The AFF1(1-308) M60A/L61A mutant shows no suppression of Tat transactivation	PubMed
	tat	The crystal structure provides a structural basis for the modulation of TAR RNA binding by acetylation of Lys28 in Tat and for involvement of Asn257 in Cyclin T1	PubMed
	tat	The crystal structure demonstrates that Met55Thr substitution in AFF4 forms a hydrogen bond with Glu246 of Cyclin T1, which is not as favorable for HIV-1 Tat docking	PubMed
	tat	The Tat-AFF4-P-TEFb complex containing HIV-1 Tat (residues 1-48), human Cyclin T1 (residues 1-266), human Cdk9 (residues 7-332), and human AFF4 (residues 27-69) is determined by the crystal structure analysis	PubMed
	tat	HIV-1 Tat recruits PPM1G phosphatase protein to dephosphorylate the T loop of CDK9 and release P-TEFb from the 7SK snRNP complex	PubMed
	tat	The interaction of Tip110 with HIV-1 Tat and the RNAPII C-terminal domain leads to the recruitment of increased CDK9/CycT1 to the transcription complex	PubMed
	tat	HIV-1 Tat forms at least two distinct P-TEFb-containing complexes. Tatcom1 is composed of P-TEFb, AF9, ENL, ELL, AFF1, AFF4, and PAF1, presenting strong CTD-kinase activity, while Tatcom2 consists of 7SK, LARP7, and MEPCE with two molecules of Tat/P-TEFb	PubMed
	tat	A small molecule compound C3 inhibits HIV-1 replication by suppressing HIV-1 Tat-mediated HIV-1 LTR-driven gene expression and phosphorylation of RNAPII through inhibition of Tat binding to CycT1	PubMed
	tat	Small molecule ligands disrupt the CDK9/Cyclin T1/Tat complex and dissociate CDK9 away from the HIV-1 transcription complex	PubMed
	tat	Phosphorylation of CDK9 at position Ser175 regulates the competition between HIV-1 Tat and BRD4 for P-TEFb binding	PubMed
	tat	Yeast two-hybrid assay shows that CCNT1 isoform b loss the ability of binding to HIV-1 Tat	PubMed
	tat	JQ1, a small molecule inhibitor of Brd4, increases CDK9 T-loop phosphorylation in a Tat-dependent manner and partially dissociates P-TEFb from 7SK snRNP in Jurkat cells	PubMed
	tat	CCNT1 that lacks exon 7 inhibits HIV-1 replication through the attenuation of HIV-1 Tat/long terminal repeat (LTR)-driven transcription	PubMed
	tat	HIV-1 Tat mutations at positions Y26 and K28 show the most defect in the Tat:TAR:P-TEFb complex formation, but Tat:P-TEFb assembly is not abolished	PubMed
	tat	HIV-1 Tat mutations at positions P3, P6, W11, K12, T20, T23, V36, I39, T40, and Y47 show decreased Tat activity and P-TEFb assembly/Cdk9 activation, with three residues P3, P6, and W11 possibly involved in Cdk9 interactions	PubMed
	tat	Coexpression of RNA-binding domain deficient Tat (T-RS) and two fusion proteins CycT1N-Rev and Cdk9-Rev synergistically stimulates transcription when P-TEFb is tethered to RNA through Rev, and thus T-RS is no longer an inhibitor	PubMed
	tat	An RNA-binding domain deficient Tat excludes wild-type Tat from the promoter by preferentially assembling with P-TEFb through the Tat activation domain, but can not facilitate transfer of P-TEFb to TAR, thus blocking transition to elongation	PubMed
	tat	The P-TEFb binding region (amino acids 1209-1362) of BRD4 is required for HIV-1 Tat-mediated release of P-TEFb from the 7SK snRNP	PubMed
	tat	HIV-1 Tat-mediated release of P-TEFb from the 7SK sn RNP results in a conformational change in 7SK RNA and release of HEXIM1 from the complex	PubMed
	tat	P-TEFb is required for HIV-1 Tat-mediated transcriptional activation	PubMed
	tat	HIV-1 Tat stimulates the phosphorylation of SPT5 by P-TEFb during transactivation of the HIV-1 LTR promoter	PubMed
	tat	Expression of human cyclin T1 in transgenic mice is sufficient to support HIV-1 Tat-mediated transactivation in primary mouse CD4 T lymphocytes and monocytes/macrophages and increases in vitro and in vivo HIV-1 production	PubMed
	tat	HIV-1 Q35L mutant fails to efficiently bind either CDK9 or CycT1 resulting in the defective gene expression. However, the I39Q mutation rescues the Q35L mutant's loss of function	PubMed
	tat	Mutant CycT1-U7, which contains four substitutions and one deletion in the N-terminal cyclin box (67HRFYM71 to IIWE), binds HIV-1 Tat to inhibit HIV transcription. The CycT1-U7 protein fails to interact with Cdk9 or HEXIM1	PubMed
	tat	SKIP is required for Tat transactivation in vivo and stimulates HIV-1 transcription elongation by associating with CycT1:CDK9 (P-TEFb) and Tat:P-TEFb complexes both in nuclear extracts and in recombinant Tat:P-TEFb:TAR RNA complexes in vitro	PubMed
	tat	HIV-1 Tat and P-TEFb undergo constant association and dissociation cycles with TAR and the elongating polymerase in living cells	PubMed
	tat	Mutant CycT1-U7 shows a potent dominant negative effect on Tat-dependent HIV transcription by specifically targeting Tat into the proteasome degradation pathway	PubMed
	tat	HIV-1 Tat Lys-28 is required for CycT1-dependent RNA binding. Asn 250, but not Asn-257, in the TRM region of CycT1 is important for unacetylated Tat binding	PubMed
	tat	Tat-SF1 is a required cofactor for HIV-1 Tat activity that complexes with P-TEFb and Tat, and stimulates Tat-mediated activation of the HIV-1 LTR promoter	PubMed
	tat	Hsp70 and Hsp90/Cdc37 stabilize CDK9 as well as the assembly of an active P-TEFb complex which is stimulated by HIV-1 Tat during HIV-1 transcriptional activation	PubMed
	tat	HIV-1 Tat competes with CIITA for the binding to P-TEFb, leading to the downregulation of MHC class II gene expression	PubMed
	tat	MAQ1 and 7SK RNA interact with P-TEFb and compete with the binding of HIV-1 Tat to cyclin T1, suggesting the TAR RNA/Tat lentivirus system evolved to subvert the cellular 7SK RNA/MAQ1 system	PubMed
	tat	The p160 nuclear receptor co-activator GRIP1 binds to the N-terminal region of HIV-1 Tat, bridging HIV-1 LTR promoter-bound factors to the Tat-P-TEFb complex and enhancing the transactivating activity of Tat	PubMed
	tat	The human I-mfa domain-containing protein (HIC) interacts with both P-TEFb and HIV-1 Tat, and modulates Tat transactivation of the HIV-1 LTR promoter	PubMed
	tat	Cyclin T1 is capable of recruiting CDK9 and HIV-1 Tat to splicing factor-rich nuclear speckle regions, suggesting nuclear speckles are a site of P-TEFb and Tat function	PubMed
	tat	The up and downregulation of expression of CDK9 and cyclin T1 or sequestration of cyclin T1 in infected cells may regulate HIV-1 latency by up or downregulating HIV-1 Tat transcriptional activation	PubMed
	tat	Amino acids 260-263 of cyclin T1 are critical for HIV-1 Tat-mediated transcriptional activation, and mediate the species specificity of cyclin T1 and P-TEFb binding to Tat	PubMed
	tat	P-TEFb regulates HIV-1 Tat-mediated activation of transcription through two built-in auto inhibitory mechanisms, autophosphorylation of CDK9 and cyclin T1 binding to the transcription elongation factor Tat-SF1	PubMed
	tat	Mutant CycT1 protein containing triple T-to-A mutations in the N-terminal region (amino acids T143, T149, and T155) associates with CDK9 and HIV-1 Tat as a kinase-negative complex and blocks HIV transactivation	PubMed
	tat	Undetectable CycT1 protein and un-phosphorylation of CDK9 in undifferentiated monocytes result in the lack of Tat transactivation of the LTR promoter in early viral life cycle	PubMed
	tat	The growth factor granulin and the promyelocytic leukemia (PML) protein regulate HIV-1 Tat-mediated transcriptional activation by competing with the Tat interaction with cyclin T1/P-TEFb	PubMed
	tat	HIV-1 Tat-mediated stimulation of RNA polymerase II C-terminal domain phosphorylation by P-TEFb leads to stimulation of co-transcriptional capping of HIV-1 mRNA	PubMed
	tat	Acetylation of HIV-1 Tat by cellular histone acetyltransferases regulates the binding of Tat to P-TEFb	PubMed
	tat	Interaction of P-TEFb with histone H1 results in its phosphorylation at position Ser-183 in a Tat-dependent manner, which is necessary for transcription from the HIV-1 LTR	PubMed
	tat	PARP1 negatively regulates HIV-1 transcription by directly competing with Tat-P-TEFb complex for binding to TAR RNA	PubMed
	tat	PRMT6-mediated arginine methylation of HIV-1 Tat negatively affects Tat-TAR-cyclin T1 ternary complex formation and diminishes cyclin T1-dependent Tat transcriptional activation	PubMed
	tat	Cyclin T1-P-TEFb is important for prostratin stimulation of HIV-1 virus expression in the presence of functional Tat	PubMed
	tat	IL-10 inhibits HIV-1 gene expression in an HIV-1 Tat-dependent manner by downregulating cyclin T1 expression through the induction of proteasome-mediated proteolysis in human macrophages	PubMed
	tat	HIV-1 Tat interaction with cyclin T1 is required for the repression of mannose receptor (MR) and bone morphogenetic protein receptor-2 (BMPR2) promoters	PubMed
	tat	P-TEFb, Puralpha and HIV-1 Tat cooperate to activate the TNFalpha promoter	PubMed
Vpr	vpr	HIV-1 Vpr binds to cyclin T1 (amino acids 300-479) in a ternary complex of HIV-1 Tat, Vpr, Cyclin T1, and CDK9, and enhances Tat transactivation of the viral LTR promoter	PubMed
reverse transcriptase	gag-pol	CCNT1 isoform b inhibits HIV-1 RT activity in the media and HIV-1 Gag protein expression in the cell lysate in a dose-dependent manner	PubMed

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Interactions

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Products	Interactant	Other Gene	Complex	Source	Pubs	Description

General gene information

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Markers

STS-H84164 (e-PCR)
- UniSTS:46351

RH104016 (e-PCR)
- UniSTS:98341

SHGC-33565 (e-PCR)
- UniSTS:55887

RH17417 (e-PCR)
- UniSTS:24937

SHGC-153516 (e-PCR)
- UniSTS:177793

RH70421 (e-PCR)
- UniSTS:70291

CCNT1_2415 (e-PCR)
- UniSTS:280479

RH44408 (e-PCR)
- UniSTS:38568

PMC153984P1 (e-PCR)
- UniSTS:271280

CCNT1 (e-PCR)
- UniSTS:503997

PMC136632P1 (e-PCR)
- UniSTS:270800

Clone Names

FLJ11223, DKFZp313A1331, DKFZp313N0919, DKFZp313O1211

Gene Ontology Provided by GOA

Function	Evidence Code	Pubs
enables 7SK snRNA binding	IDA Inferred from Direct Assay more info	PubMed
enables DNA binding	IDA Inferred from Direct Assay more info	PubMed
enables DNA-binding transcription factor binding	IPI Inferred from Physical Interaction more info	PubMed
enables RNA polymerase binding	IPI Inferred from Physical Interaction more info	PubMed
enables chromatin binding	IEA Inferred from Electronic Annotation more info
enables cyclin-dependent protein serine/threonine kinase activator activity	IBA Inferred from Biological aspect of Ancestor more info
enables cyclin-dependent protein serine/threonine kinase activator activity	IDA Inferred from Direct Assay more info	PubMed
enables molecular condensate scaffold activity	IDA Inferred from Direct Assay more info	PubMed
enables protein binding	IPI Inferred from Physical Interaction more info	PubMed
enables protein kinase binding	IEA Inferred from Electronic Annotation more info
enables transcription cis-regulatory region binding	IEA Inferred from Electronic Annotation more info

Process	Evidence Code	Pubs
involved_in cell division	IEA Inferred from Electronic Annotation more info
involved_in positive regulation by host of viral transcription	IDA Inferred from Direct Assay more info	PubMed
involved_in positive regulation by host of viral transcription	NAS Non-traceable Author Statement more info	PubMed
involved_in positive regulation of DNA-templated transcription, elongation	IBA Inferred from Biological aspect of Ancestor more info
involved_in positive regulation of transcription by RNA polymerase II	IBA Inferred from Biological aspect of Ancestor more info
involved_in positive regulation of transcription by RNA polymerase II	IDA Inferred from Direct Assay more info	PubMed
involved_in positive regulation of transcription elongation by RNA polymerase II	IDA Inferred from Direct Assay more info	PubMed
involved_in regulation of cyclin-dependent protein serine/threonine kinase activity	TAS Traceable Author Statement more info	PubMed
involved_in response to xenobiotic stimulus	IEA Inferred from Electronic Annotation more info
involved_in transcription by RNA polymerase II	TAS Traceable Author Statement more info	PubMed

Component	Evidence Code	Pubs
part_of P-TEFb complex	IDA Inferred from Direct Assay more info	PubMed
part_of cyclin/CDK positive transcription elongation factor complex	IBA Inferred from Biological aspect of Ancestor more info
part_of cyclin/CDK positive transcription elongation factor complex	IDA Inferred from Direct Assay more info	PubMed
part_of cyclin/CDK positive transcription elongation factor complex	IPI Inferred from Physical Interaction more info	PubMed
located_in cytosol	IDA Inferred from Direct Assay more info
NOT located_in nucleolus	IDA Inferred from Direct Assay more info	PubMed
located_in nucleoplasm	IDA Inferred from Direct Assay more info
located_in nucleoplasm	TAS Traceable Author Statement more info
is_active_in nucleus	IBA Inferred from Biological aspect of Ancestor more info
is_active_in nucleus	IDA Inferred from Direct Assay more info	PubMed
located_in nucleus	IDA Inferred from Direct Assay more info	PubMed

General protein information

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Preferred Names: cyclin-T1

Names: CDK9-associated C-type protein; MLLT10/CCNT1 fusion; cyclin C-related protein; human immunodeficiency virus type 1 (HIV-1) expression (elevated) 1

NCBI Reference Sequences (RefSeq)

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RefSeqs maintained independently of Annotated Genomes

These reference sequences exist independently of genome builds. Explain

These reference sequences are curated independently of the genome annotation cycle, so their versions may not match the RefSeq versions in the current genome build. Identify version mismatches by comparing the version of the RefSeq in this section to the one reported in Genomic regions, transcripts, and products above.

mRNA and Protein(s)

NM_001240.4 → NP_001231.2 cyclin-T1 isoform a

See identical proteins and their annotated locations for NP_001231.2

Status: REVIEWED

Description

Transcript Variant: This variant (a, also known as FL and CycT1a) encodes the longest isoform (a).

Source sequence(s)

AC079951, AF045161, BX098766

Consensus CDS

CCDS8766.1

UniProtKB/Swiss-Prot

A9XU13, E7EX76, O60563, O60581

UniProtKB/TrEMBL

A8K4M5

Related

ENSP00000261900.3, ENST00000261900.8

Conserved Domains (2) summary

cd20595
Location:10 → 147

CYCLIN_CCNT1_rpt1; first cyclin box found in cyclin-T1 (CCNT1)

cd20597
Location:151 → 259

CYCLIN_CCNT1_rpt2; second cyclin box found in cyclin-T1 (CCNT1)
NM_001277842.2 → NP_001264771.1 cyclin-T1 isoform b

See identical proteins and their annotated locations for NP_001264771.1

Status: REVIEWED

Description

Transcript Variant: This variant (b, also known as dE7 and CycT1b) lacks an exon in the coding region, which results in a frameshift and an early stop codon, compared to variant a. The encoded isoform (b) has a shorter and distinct C-terminus, compared to isoform a. While this variant may be considered a candidate for nonsense-mediated decay, experimental evidence suggests that it is protein coding (PMID: 23569210 and PMID: 22692005).

Source sequence(s)

AC079951, AK290990, EF688064

Consensus CDS

CCDS61109.1

Related

ENSP00000481035.1, ENST00000618666.4

Conserved Domains (2) summary

cd00043
Location:38 → 109

CYCLIN; Cyclin box fold. Protein binding domain functioning in cell-cycle and transcription control. Present in cyclins, TFIIB and Retinoblastoma (RB).The cyclins consist of 8 classes of cell cycle regulators that regulate cyclin dependent kinases (CDKs). TFIIB ...

cl28538
Location:1 → 153

CCL1; Cdk activating kinase (CAK)/RNA polymerase II transcription initiation/nucleotide excision repair factor TFIIH/TFIIK, cyclin H subunit [Cell division and chromosome partitioning / Transcription / DNA replication, recombination, and repair]
NM_001413198.1 → NP_001400127.1 cyclin-T1 isoform c

Status: REVIEWED

Source sequence(s)

AC079951
NM_001413199.1 → NP_001400128.1 cyclin-T1 isoform d

Status: REVIEWED

Source sequence(s)

AC079951
NM_001413200.1 → NP_001400129.1 cyclin-T1 isoform e

Status: REVIEWED

Source sequence(s)

AC079951