3cf5
Thiopeptide antibiotic Thiostrepton bound to the large ribosomal subunit of Deinococcus radioduransThiopeptide antibiotic Thiostrepton bound to the large ribosomal subunit of Deinococcus radiodurans
Structural highlights
Warning: this is a large structure, and loading might take a long time or not happen at all. Function[RL11_DEIRA] This protein binds directly to 23S ribosomal RNA and also contacts the CTC protein (RL25).[HAMAP-Rule:MF_00736_B] [RL22_DEIRA] This protein binds specifically to 23S rRNA; its binding is stimulated by other ribosomal proteins, e.g. L4, L17, and L20. It is important during the early stages of 50S assembly. It makes multiple contacts with different domains of the 23S rRNA in the assembled 50S subunit and ribosome (By similarity).[HAMAP-Rule:MF_01331_B] The globular domain of the protein is located by the polypeptide exit tunnel on the outside of the subunit while an extended beta-hairpin forms part of the wall of the tunnel. Forms a pair of "tweezers" with L32 that hold together two different domains of the 23S rRNA. Interacts with the tunnel-blocking modified macrolide azithromycin. Upon binding of the macrolide troleadomycin to the ribosome, the tip of the beta-hairpin is displaced, which severely restricts the tunnel. This and experiments in E.coli have led to the suggestion that it is part of the gating mechanism involved in translation arrest in the absence of the protein export system.[HAMAP-Rule:MF_01331_B] [RL3_DEIRA] One of the primary rRNA binding proteins, it binds directly near the 3'-end of the 23S rRNA, where it nucleates assembly of the 50S subunit (By similarity).[HAMAP-Rule:MF_01325_B] [RL34_DEIRA] Binds the 23S rRNA.[HAMAP-Rule:MF_00391] [RL18_DEIRA] This is one of the proteins that binds and mediates the attachment of the 5S RNA into the large ribosomal subunit, where it forms part of the central protuberance.[HAMAP-Rule:MF_01337_B] [RL23_DEIRA] One of the early assembly protein (By similarity) it binds 23S rRNA. One of the proteins that surrounds the polypeptide exit tunnel on the outside of the subunit. Forms the main docking site for trigger factor binding to the ribosome (PubMed:16091460 and PubMed:16271892).[HAMAP-Rule:MF_01369] [RL33_DEIRA] Binds the 23S rRNA and the E site tRNA.[HAMAP-Rule:MF_00294] [RL19_DEIRA] This protein is located at the 30S-50S ribosomal subunit interface and may play a role in the structure and function of the aminoacyl-tRNA binding site (By similarity). Binds the 23S rRNA.[HAMAP-Rule:MF_00402] [RL32_DEIRA] Forms a cluster with L17 and L22, and with L22, a pair of "tweezers" that hold together all the domains of the 23S rRNA. Interacts with the antibiotic troleandomycin which blocks the peptide exit tunnel.[HAMAP-Rule:MF_00340] [RL24_DEIRA] One of two assembly initiator proteins, it binds directly to the 5'-end of the 23S rRNA, where it nucleates assembly of the 50S subunit (By similarity).[HAMAP-Rule:MF_01326_B] One of the proteins that surrounds the polypeptide exit tunnel on the outside of the subunit. Contacts trigger factor (TF) when it is bound to the ribosome; this contact may expose a hydrophobic crevice in TF (PubMed:16271892).[HAMAP-Rule:MF_01326_B] [RL14_DEIRA] Forms part of two intersubunit bridges in the 70S ribosome (By similarity). Binds to 23S rRNA.[HAMAP-Rule:MF_01367] [RL17_DEIRA] Binds to the 23S rRNA.[HAMAP-Rule:MF_01368] [RL2_DEIRA] One of the primary rRNA binding proteins. Required for association of the 30S and 50S subunits to form the 70S ribosome, for tRNA binding and peptide bond formation. It has been suggested to have peptidyltransferase activity; this is somewhat controversial. Makes several contacts with the 16S rRNA in the 70S ribosome (By similarity).[HAMAP-Rule:MF_01320_B] [RL29_DEIRA] Binds the 23S rRNA. One of the proteins that surrounds the polypeptide exit tunnel on the outside of the subunit.[HAMAP-Rule:MF_00374] [RL27_DEIRA] Binds the 5S and 23S rRNAs and also the tRNA in the P site.[HAMAP-Rule:MF_00539] [RL30_DEIRA] Binds the 5S and 23S rRNAs.[HAMAP-Rule:MF_01371] [RL35_DEIRA] Binds the 23S rRNA.[HAMAP-Rule:MF_00514] [RL5_DEIRA] This is 1 of the proteins that binds and probably mediates the attachment of the 5S RNA into the large ribosomal subunit, where it forms part of the central protuberance. In the 70S ribosome it contacts protein S13 of the 30S subunit (bridge B1b), connecting the 2 subunits; this bridge is implicated in subunit movement (By similarity). Contacts the P site tRNA; the 5S rRNA and some of its associated proteins might help stabilize positioning of ribosome-bound tRNAs.[HAMAP-Rule:MF_01333_B] [RL13_DEIRA] This protein is one of the early assembly proteins of the 50S ribosomal subunit (By similarity). Binds to the 23S rRNA.[HAMAP-Rule:MF_01366_B] [RL15_DEIRA] Binds to the 23S rRNA.[HAMAP-Rule:MF_01341_B] [RL16_DEIRA] Binds the 5S and 23S rRNAs and is also seen to make contacts with the A and P site tRNAs. Interacts with A site tRNA mimics, and is probably one of the key factors, along with a helix of the 23S rRNA, in positioning tRNA stems in the peptidyl-transferase center.[HAMAP-Rule:MF_01342] [RL21_DEIRA] Binds directly to 23S rRNA, probably serving to organize its structure.[HAMAP-Rule:MF_01363] [RL4_DEIRA] One of the primary rRNA binding proteins, this protein initially binds near the 5'-end of the 23S rRNA. It is important during the early stages of 50S assembly (By similarity).[HAMAP-Rule:MF_01328_B] Makes multiple contacts with different domains of the 23S rRNA in the assembled 50S subunit.[HAMAP-Rule:MF_01328_B] This protein is located close to the polypeptide exit tunnel, and interacts with the modified macrolide azithromycin, which blocks the tunnel.[HAMAP-Rule:MF_01328_B] [RL36_DEIRA] Binds the 23S rRNA.[HAMAP-Rule:MF_00251] [RL25_DEIRA] This is one of 3 proteins that mediate the attachment of the 5S rRNA onto the large ribosomal subunit. This protein has three domains. The N-terminal one is bound on the solvent face, the middle domain fills the space between the 5S rRNA and the L11 arm contacting the 23S rRNA while the C-terminal domain is on the edge of the intersubunit interface and contacts the A site. The protein conformation changes upon binding of a tRNA mimic to the A site, although the mimic does not interact directly with CTC itself, consistent with CTCs presumed role in moderating A site binding.[HAMAP-Rule:MF_01334] [RL6_DEIRA] It is located near the subunit interface in the base of the L7/L12 stalk, and near the tRNA binding site of the peptidyltransferase center (By similarity). This protein binds to the 23S rRNA, and is important in its secondary structure.[HAMAP-Rule:MF_01365] [RL20_DEIRA] Binds directly to 23S rRNA, probably serving to organize its structure.[HAMAP-Rule:MF_00382] [THCL_STRAJ] Has bacteriocidal activity. Inhibits bacterial protein biosynthesis by acting on the elongation factor Tu (EF-Tu) (By similarity). 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 PubMedThe thiopeptide class of antibiotics targets the GTPase-associated center (GAC) of the ribosome to inhibit translation factor function. Using X-ray crystallography, we have determined the binding sites of thiostrepton (Thio), nosiheptide (Nosi), and micrococcin (Micro), on the Deinococcus radiodurans large ribosomal subunit. The thiopeptides, by binding within a cleft located between the ribosomal protein L11 and helices 43 and 44 of the 23S rRNA, overlap with the position of domain V of EF-G, thus explaining how this class of drugs perturbs translation factor binding to the ribosome. The presence of Micro leads to additional density for the C-terminal domain (CTD) of L7, adjacent to and interacting with L11. The results suggest that L11 acts as a molecular switch to control L7 binding and plays a pivotal role in positioning one L7-CTD monomer on the G' subdomain of EF-G to regulate EF-G turnover during protein synthesis. Translational regulation via L11: molecular switches on the ribosome turned on and off by thiostrepton and micrococcin.,Harms JM, Wilson DN, Schluenzen F, Connell SR, Stachelhaus T, Zaborowska Z, Spahn CM, Fucini P Mol Cell. 2008 Apr 11;30(1):26-38. PMID:18406324[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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