8k6t

The minor pilin structure of FctB3 in Streptococcus

spinqualitylabelsall models 8k6t, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8k6t is a 1 chain structure with sequence from Streptococcus pyogenes serotype M3. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.8Å Ligands: GOL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Streptococcus pyogenes harboring an FCT type 3 genomic region display pili composed of three types of pilins. In this study, the structure of the base pilin FctB from a serotype M3 strain (FctB3) was determined at 2.8 A resolution. In accordance with the previously reported structure of FctB from a serotype T9 strain (FctB9), FctB3 was found to consist of an immunoglobulin-like domain and proline-rich tail region. Data obtained from structure comparison revealed main differences in the omega (Omega) loop structure and the proline-rich tail direction. In the Omega loop structure, a differential hydrogen bond network was observed, while the lysine residue responsible for linkage to growing pili was located at the same position in both structures, which indicated that switching of the hydrogen bond network in the Omega loop without changing the lysine position is advantageous for linkage to the backbone pilin FctA. The difference in direction of the proline-rich tail is potentially caused by a single residue located at the root of the proline-rich tail. Also, the FctB3 structure was found to be stabilized by intramolecular large hydrophobic interactions instead of an isopeptide bond. Comparisons of the FctB3 and FctA structures indicated that the FctA structure is more favorable for linkage to FctA. In addition, the heterodimer formation of FctB with Cpa or FctA was shown to be mediated by the putative chaperone SipA. Together, these findings provide an alternative FctB structure as well as insight into the interactions between pilin proteins. Analysis of FctB3 crystal structure and insight into its structural stabilization and pilin linkage mechanisms.,Takebe K, Suzuki M, Sangawa T, Kreikemeyer B, Yamaguchi M, Uzawa N, Sumitomo T, Kawabata S, Nakata M Arch Microbiol. 2023 Nov 23;206(1):4. doi: 10.1007/s00203-023-03727-1. PMID:37994962 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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