Structural highlights
Function
RSSA_HUMAN Required for the assembly and/or stability of the 40S ribosomal subunit. Required for the processing of the 20S rRNA-precursor to mature 18S rRNA in a late step of the maturation of 40S ribosomal subunits. Also functions as a cell surface receptor for laminin. Plays a role in cell adhesion to the basement membrane and in the consequent activation of signaling transduction pathways. May play a role in cell fate determination and tissue morphogenesis. Acts as a PPP1R16B-dependent substrate of PPP1CA. Also acts as a receptor for several other ligands, including the pathogenic prion protein, viruses, and bacteria.[1] [2] [3]
Publication Abstract from PubMed
Hepatitis C virus (HCV), a widespread human pathogen, is dependent on a highly structured 5'-untranslated region of its mRNA, referred to as internal ribosome entry site (IRES), for the translation of all of its proteins. The HCV IRES initiates translation by directly binding to the small ribosomal subunit (40S), circumventing the need for many eukaryotic translation initiation factors required for mRNA scanning. Here we present the cryo-EM structure of the human 40S ribosomal subunit in complex with the HCV IRES at 3.9 A resolution, determined by focused refinement of an 80S ribosome-HCV IRES complex. The structure reveals the molecular details of the interactions between the IRES and the 40S, showing that expansion segment 7 (ES7) of the 18S rRNA acts as a central anchor point for the HCV IRES. The structural data rationalizes previous biochemical and genetic evidence regarding the initiation mechanism of the HCV and other related IRESs.
Cryo-EM structure of Hepatitis C virus IRES bound to the human ribosome at 3.9-A resolution.,Quade N, Boehringer D, Leibundgut M, van den Heuvel J, Ban N Nat Commun. 2015 Jul 8;6:7646. doi: 10.1038/ncomms8646. PMID:26155016[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Terranova VP, Rao CN, Kalebic T, Margulies IM, Liotta LA. Laminin receptor on human breast carcinoma cells. Proc Natl Acad Sci U S A. 1983 Jan;80(2):444-8. PMID:6300843
- ↑ Kim K, Li L, Kozlowski K, Suh HS, Cao W, Ballermann BJ. The protein phosphatase-1 targeting subunit TIMAP regulates LAMR1 phosphorylation. Biochem Biophys Res Commun. 2005 Dec 23;338(3):1327-34. Epub 2005 Oct 25. PMID:16263087 doi:10.1016/j.bbrc.2005.10.089
- ↑ Kim KJ, Chung JW, Kim KS. 67-kDa laminin receptor promotes internalization of cytotoxic necrotizing factor 1-expressing Escherichia coli K1 into human brain microvascular endothelial cells. J Biol Chem. 2005 Jan 14;280(2):1360-8. Epub 2004 Oct 29. PMID:15516338 doi:M410176200
- ↑ Quade N, Boehringer D, Leibundgut M, van den Heuvel J, Ban N. Cryo-EM structure of Hepatitis C virus IRES bound to the human ribosome at 3.9-A resolution. Nat Commun. 2015 Jul 8;6:7646. doi: 10.1038/ncomms8646. PMID:26155016 doi:http://dx.doi.org/10.1038/ncomms8646
