pfam02813: Retro_M (this model, PSSM-Id:280904 is obsolete and has been replaced by 460707)
Retroviral M domain
Retroviruses contain a small protein, MA (matrix), which forms a protein lining immediately beneath the phospholipid membrane of the mature virus particle. MA is located in the N-terminal region of the Gag precursor polyprotein. The N-terminal segment of MA proteins directs the Gag protein to the plasma membrane where budding takes place, and has been called the M domain. This domain forms an alpha helical bundle structure.
Jiyao W et al.(2023). "The conserved domain database in 2023.",