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Paramyxovirus structural protein V/P N-terminus This family consists of several Paramyxoviridae structural protein P and V sequences. From a structural point of view, P is the best-characterized protein of the replicative complex. P is organized into two moieties that are functionally and structurally distinct: a C-terminal moiety (PCT) and an N-terminal moiety (PNT). PCT is the most conserved in sequence and contains all regions required for virus transcription, whereas PNT, which is poorly conserved, provides several additional functions required for replication. P protein plays a crucial role in the enzyme by positioning L onto the N/RNA template through an interaction with the C-terminal domain of N. Without P, L is not functional. The N, P, and L proteins of SeV and measles and mumps viruses are functionally equivalent. However, sequence identity between proteins from these viruses is limited, and the viruses have been placed in different genera (Respirovirus, Morbilivirus, and Rubulavirus, respectively). SeV P protein (568 aa) is a modular protein with distinct functional domains. The N-terminal part of P (PNT) is a chaperone for N and prevents it from binding to non-viral RNA in the infected cell. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",