7k3u

X-ray crystallographic structure model of Lactococcus lactis prolidase mutant R293S

spinqualitylabelsall models 7k3u, resolution 2.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7k3u is a 10 chain structure with sequence from Lactococcus lactis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.7Å Ligands: GOL, MN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A8WBX8_9LACT Publication Abstract from PubMed Lactococcus lactis prolidase (Xaa-Pro dipeptidase; EC.3.4.13.9) is unique from other prolidases by showing allosteric behaviour, substrate inhibition, and metal-dependent substrate specificity. We have previously shown several critical residues for these characteristics using site-directed mutagenesis and amino acid sequence-based models. In this present study, the three-dimensional structure of recombinant L. lactis prolidase was determined by X-ray crystallography at 2.25A resolution in order to provide evidences of the proposed mechanism. Three molecules are located in the crystal asymmetric unit where molecule A forms a dimer with molecule B, while molecule C forms a dimer with molecule C' in the adjacent asymmetric unit. Of all the three molecules, molecule C is less defined and incomplete. While this fact compromises the overall quality of the refined model, the functional interpretation of the structure is not compromised since the biologically-functional homodimeric configuration of L. lactis prolidase is represented by well-defined molecules A and B. The refined model confirmed that there is a twelve-residue (residues 32-43) loop structure from one subunit over the active site of the other subunit, proving the existence of the putative loop structure in our previous study. This loop is three amino acids longer than the loops of prolidases of Pyrococcus furious (1pv9) and Pyrococcus horikoshii OT3 (1wy2). The crystal structure shows the loop structure can form two states ("open" and "closed" states) through interaction between the loop and active site proximity. It supports the proposed formation of allosteric site by the loop and Arg 293. Crystallographic structure of recombinant Lactococcus lactis prolidase to support proposed structure-function relationships.,Kgosisejo O, Chen JA, Grochulski P, Tanaka T Biochim Biophys Acta Proteins Proteom. 2017 May;1865(5):473-480. doi:, 10.1016/j.bbapap.2017.02.004. Epub 2017 Feb 4. PMID:28179139 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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