MU1_REOVL Major outer capsid protein involved in host cell membrane penetration. In the endocytic compartment, outer-capsid protein sigma-3 is removed by cathepsin proteases, which exposes the viral membrane-penetration protein mu-1. Both myristoylated peptides mu-1N and phi are released during infectious subvirion particles (ISVP) formation in the endosome. They associate with host membranes and mu-1N induces permeabilization and delivery of transcriptionally active viral particles into the host cell cytoplasm. Seems to induce apoptosis in the host cell.[1][2][3][4][5] The viral outer shell polypeptides, of which mu-1 is one, impose structural constraints that prevent elongation of nascent transcripts by the RNA-dependent RNA polymerase lambda-3.[6][7][8][9][10]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
↑Farsetta DL, Chandran K, Nibert ML. Transcriptional activities of reovirus RNA polymerase in recoated cores. Initiation and elongation are regulated by separate mechanisms. J Biol Chem. 2000 Dec 15;275(50):39693-701. PMID:11007773 doi:https://dx.doi.org/10.1074/jbc.M004562200
↑Odegard AL, Chandran K, Zhang X, Parker JS, Baker TS, Nibert ML. Putative autocleavage of outer capsid protein micro1, allowing release of myristoylated peptide micro1N during particle uncoating, is critical for cell entry by reovirus. J Virol. 2004 Aug;78(16):8732-45. PMID:15280481 doi:https://dx.doi.org/10.1128/JVI.78.16.8732-8745.2004
↑Coffey CM, Sheh A, Kim IS, Chandran K, Nibert ML, Parker JS. Reovirus outer capsid protein micro1 induces apoptosis and associates with lipid droplets, endoplasmic reticulum, and mitochondria. J Virol. 2006 Sep;80(17):8422-38. PMID:16912293 doi:https://dx.doi.org/80/17/8422
↑Ivanovic T, Agosto MA, Zhang L, Chandran K, Harrison SC, Nibert ML. Peptides released from reovirus outer capsid form membrane pores that recruit virus particles. EMBO J. 2008 Apr 23;27(8):1289-98. Epub 2008 Mar 27. PMID:18369316 doi:https://dx.doi.org/emboj200860
↑Farsetta DL, Chandran K, Nibert ML. Transcriptional activities of reovirus RNA polymerase in recoated cores. Initiation and elongation are regulated by separate mechanisms. J Biol Chem. 2000 Dec 15;275(50):39693-701. PMID:11007773 doi:https://dx.doi.org/10.1074/jbc.M004562200
↑Odegard AL, Chandran K, Zhang X, Parker JS, Baker TS, Nibert ML. Putative autocleavage of outer capsid protein micro1, allowing release of myristoylated peptide micro1N during particle uncoating, is critical for cell entry by reovirus. J Virol. 2004 Aug;78(16):8732-45. PMID:15280481 doi:https://dx.doi.org/10.1128/JVI.78.16.8732-8745.2004
↑Coffey CM, Sheh A, Kim IS, Chandran K, Nibert ML, Parker JS. Reovirus outer capsid protein micro1 induces apoptosis and associates with lipid droplets, endoplasmic reticulum, and mitochondria. J Virol. 2006 Sep;80(17):8422-38. PMID:16912293 doi:https://dx.doi.org/80/17/8422
↑Ivanovic T, Agosto MA, Zhang L, Chandran K, Harrison SC, Nibert ML. Peptides released from reovirus outer capsid form membrane pores that recruit virus particles. EMBO J. 2008 Apr 23;27(8):1289-98. Epub 2008 Mar 27. PMID:18369316 doi:https://dx.doi.org/emboj200860
