3hbu | pdb_00003hbu

PrtC methionine mutants: M226H DESY

spinqualitylabelsall models 3hbu, resolution 1.77Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3hbu is a 2 chain structure with sequence from "erwinia_carotovora_var._chrysanthemi"_(burkholder_et_al._1953)_dye_1969 "erwinia carotovora var. chrysanthemi" (burkholder et al. 1953) dye 1969. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, CL, ZN Related: 1go8, 1go7, 3hb2, 1k7g, 3hbv Gene: prtC ("Erwinia carotovora var. chrysanthemi" (Burkholder et al. 1953) Dye 1969) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Abstract The metzincins constitute a subclan of metalloproteases possessing a HEXXHXXGXXH/D zinc-binding consensus sequence where the three histidines are zinc ligands and the glutamic acid the catalytic base. A completely conserved methionine is located downstream of this motif. Families of the metzincin clan comprise, besides others, astacins, ADAMS proteases, matrix metalloproteases and serralysins. The latter are extracellular 50 kDa proteases secreted by Gram-negative bacteria via a type I secretion system. While there is a large body of structural and biochemical information available, the function of the conserved methionine has not been convincingly clarified yet. Here we present the crystal structures of a number of mutants of the serralysin member protease C with the conserved methionine being replaced by Ile, Ala and His. Together with our former report on the leucine and cysteine mutants, we demonstrate here that replacement of the methionine side chain results in an increasing distortion of the zinc-binding geometry, especially pronounced in the chi(2) angles of the first and third histidine of the consensus sequence. This is correlated with an increasing loss of proteolytic activity and a sharp increase of flexibility of large segments of the polypeptide chain. Metzincin's canonical methionine is responsible for the structural integrity of the zinc-binding site.,Oberholzer AE, Bumann M, Hege T, Russo S, Baumann U Biol Chem. 2009 Jun 27. PMID:19558324 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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