3mca
From Proteopedia
Structure of the Dom34-Hbs1 Complex and implications for its role in No-Go decay
Structural highlights
Function[HBS1_SCHPO] Involved in protein translation. Together with dom34, may function in recognizing stalled ribosomes and triggering endonucleolytic cleavage of the mRNA, a mechanism to release non-functional ribosomes and degrade damaged mRNAs (By similarity).[UniProtKB:P32769] [DOM34_SCHPO] Involved in protein translation. Together with hbs1, may function in recognizing stalled ribosomes and triggering endonucleolytic cleavage of the mRNA, a mechanism to release non-functional ribosomes and degrade damaged mRNAs. The complex formed by dom34 and hbs1 has ribonuclease activity towards double-stranded RNA substrates, but does not cleave single-stranded RNA. Acts as endonuclease; has no exonuclease activity. Increases the affinity of hbs1 for GTP, but nor for GDP. Promotes G1 progression and differentiation and is involved in mitotic and meiotic cell divisions (By similarity).[UniProtKB:P33309] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedNo-go decay (NGD) targets mRNAs with stalls in translation elongation for endonucleolytic cleavage in a process involving the Dom34 and Hbs1 proteins. The crystal structure of a Schizosaccharomyces pombe Dom34-Hbs1 complex reveals an overall shape similar to that of eRF1-eRF3-GTP and EF-Tu-tRNA-GDPNP. Similarly to eRF1 and GTP binding to eRF3, Dom34 and GTP bind to Hbs1 with strong cooperativity, and Dom34 acts as a GTP-dissociation inhibitor (GDI). A marked conformational change in Dom34 occurs upon binding to Hbs1, leading Dom34 to resemble a portion of a tRNA and to position a conserved basic region in a position expected to be near the peptidyl transferase center. These results support the idea that the Dom34-Hbs1 complex functions to terminate translation and thereby commit mRNAs to NGD. Consistent with this role, NGD at runs of arginine codons, which cause a strong block to elongation, is independent of the Dom34-Hbs1 complex. Structure of the Dom34-Hbs1 complex and implications for no-go decay.,Chen L, Muhlrad D, Hauryliuk V, Cheng Z, Lim MK, Shyp V, Parker R, Song H Nat Struct Mol Biol. 2010 Oct;17(10):1233-40. Epub 2010 Oct 3. PMID:20890290[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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