1yit
From Proteopedia
Crystal Structure Of Virginiamycin M and S Bound To The 50S Ribosomal Subunit Of Haloarcula Marismortui
Structural highlights
FunctionRL44E_HALMA Binds to the 23S rRNA. Binds deacetylated tRNA in the E site; when the tRNA binds a stretch of 7 amino acids are displaced to allow binding.[HAMAP-Rule:MF_01476] 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 PubMedCrystal structures of H. marismortui large ribosomal subunits containing the mutation G2099A (A2058 in E. coli) with erythromycin, azithromycin, clindamycin, virginiamycin S, and telithromycin bound explain why eubacterial ribosomes containing the mutation A2058G are resistant to them. Azithromycin binds almost identically to both G2099A and wild-type subunits, but the erythromycin affinity increases by more than 10(4)-fold, implying that desolvation of the N2 of G2099 accounts for the low wild-type affinity for macrolides. All macrolides bind similarly to the H. marismortui subunit, but their binding differs significantly from what has been reported in the D. radioidurans subunit. The synergy in the binding of streptogramins A and B appears to result from a reorientation of the base of A2103 (A2062, E. coli) that stacks between them. The structure of large subunit containing a three residue deletion mutant of L22 shows a change in the L22 structure and exit tunnel shape that illuminates its macrolide resistance phenotype. Structures of MLSBK antibiotics bound to mutated large ribosomal subunits provide a structural explanation for resistance.,Tu D, Blaha G, Moore PB, Steitz TA Cell. 2005 Apr 22;121(2):257-70. PMID:15851032[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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