3tw0

Structural Analysis of Adhesive Tip pilin, GBS104 from Group B Streptococcus agalactiae

spinqualitylabelsall models 3tw0, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3tw0 is a 4 chain structure with sequence from Streptococcus agalactiae serogroup V. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: ACT, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q8E0S5_STRA5 Publication Abstract from PubMed The crystal structure of a 75 kDa central fragment of GBS104, a tip pilin from the 2063V/R strain of Streptococcus agalactiae (group B streptococcus; GBS), is reported. In addition, a homology model of the remaining two domains of GBS104 was built and a model of full-length GBS104 was generated by combining the homology model (the N1 and N4 domains) and the crystal structure of the 75 kDa fragment (the N2 and N3 domains). This rod-shaped GBS104 model is constructed of three IgG-like domains (the N1, N2 and N4 domains) and one vWFA-like domain (the N3 domain). The N1 and N2 domains of GBS104 are assembled with distinct and remote segments contributed by the N- and C-termini. The metal-binding site in the N3 domain of GBS104 is in the closed/low-affinity conformation. Interestingly, this domain hosts two long arms that project away from the metal-binding site. Using site-directed mutagenesis, two cysteine residues that lock the N3 domain of GBS104 into the open/high-affinity conformation were introduced. Both wild-type and disulfide-locked recombinant proteins were tested for binding to extracellular matrix proteins such as collagen, fibronectin, fibrinogen and laminin, and an increase in fibronectin binding affinity was identified for the disulfide-locked N3 domain, suggesting that induced conformational changes may play a possible role in receptor binding. Structure of Streptococcus agalactiae tip pilin GBS104: a model for GBS pili assembly and host interactions.,Krishnan V, Dwivedi P, Kim BJ, Samal A, Macon K, Ma X, Mishra A, Doran KS, Ton-That H, Narayana SV Acta Crystallogr D Biol Crystallogr. 2013 Jun;69(Pt 6):1073-89. doi:, 10.1107/S0907444913004642. Epub 2013 May 15. PMID:23695252 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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