4wvj

Crystal structure of the Type-I signal peptidase from Staphylococcus aureus (SpsB) in complex with an inhibitor peptide (pep3).

spinqualitylabelsall models 4wvj, resolution 1.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4wvj is a 2 chain structure with sequence from Escherichia coli K-12, Staphylococcus aureus and Staphylococcus aureus subsp. aureus str. Newman. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.95Å Ligands: GLC, PRD_900001 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function LEP_STAAC Essential for cell viability.MALE_ECOLI Involved in the high-affinity maltose membrane transport system MalEFGK. Initial receptor for the active transport of and chemotaxis toward maltooligosaccharides. Publication Abstract from PubMed Bacterial type I signal peptidases (SPases) are membrane-anchored serine proteases that process the signal peptides of proteins exported via the Sec and Tat secretion systems. Despite their crucial importance for bacterial virulence and their attractiveness as drug targets, only one such enzyme, LepB from Escherichia coli, has been structurally characterized, and the transient nature of peptide binding has stymied attempts to directly visualize SPase-substrate complexes. Here, the crystal structure of SpsB, the type I signal peptidase from the Gram-positive pathogen Staphylococcus aureus, is reported, and a peptide-tethering strategy that exploits the use of carrier-driven crystallization is described. This enabled the determination of the crystal structures of three SpsB-peptide complexes, both with cleavable substrates and with an inhibitory peptide. SpsB-peptide interactions in these complexes are almost exclusively limited to the canonical signal-peptide motif Ala-X-Ala, for which clear specificity pockets are found. Minimal contacts are made outside this core, with the variable side chains of the peptides accommodated in shallow grooves or exposed faces. These results illustrate how high fidelity is retained despite broad sequence diversity, in a process that is vital for cell survival. Peptide binding to a bacterial signal peptidase visualized by peptide tethering and carrier-driven crystallization.,Ting YT, Harris PW, Batot G, Brimble MA, Baker EN, Young PG IUCrJ. 2016 Jan 1;3(Pt 1):10-9. doi: 10.1107/S2052252515019971. eCollection 2016 , Jan 1. PMID:26870377 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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