4icq | pdb_00004icq

Structural basis for substrate recognition and reaction mechanism of bacterial aminopeptidase peps

spinqualitylabelsall models 4icq, resolution 2.25Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4icq is a 2 chain structure with sequence from Streptococcus pneumoniae TIGR4. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A0H2UN95_STRPN Publication Abstract from PubMed The specificity of proteases for the residues in and length of substrates is key to understanding their regulatory mechanism, but little is known about length selectivity. Crystal structure analyses of the bacterial aminopeptidase PepS, combined with functional and single-molecule FRET assays, have elucidated a molecular basis for length selectivity. PepS exists in open and closed conformations. Substrates can access the binding hole in the open conformation, but catalytic competency is only achieved in the closed conformation by formation of the S1 binding pocket and proximal movement of Glu343, a general base, to the cleavage site. Hence, peptides longer than the depth of the binding hole block the transition from the open to the closed conformation, and thus length selection is a prerequisite for catalytic activation. A triple-sieve interlock mechanism is proposed featuring the coupling of length selectivity with residue specificity and active-site positioning. Structure-based elucidation of the regulatory mechanism for aminopeptidase activity.,Ta HM, Bae S, Han S, Song J, Ahn TK, Hohng S, Lee S, Kim KK Acta Crystallogr D Biol Crystallogr. 2013 Sep;69(Pt 9):1738-47. doi:, 10.1107/S0907444913012651. Epub 2013 Aug 15. PMID:23999297 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aminopeptidase 3D structures

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