3pt5 | pdb_00003pt5

Crystal structure of NanS

spinqualitylabelsall models 3pt5, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3pt5 is a 1 chain structure with sequence from Escherichia coli 0157:h7 edl933. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: ECs5268, YjhS (Escherichia coli 0157:H7 EDL933) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed There is a high prevalence of sialic acid in a number of different organisms, resulting in there being a myriad of different enzymes that can exploit it as a fermentable carbon source. One such enzyme is NanS, a carbohydrate esterase that we show here deacetylates the 9 position of 9-O-sialic acid so that it can be readily transported into the cell for catabolism. Through structural studies we show that NanS adopts a SGNH hydrolase fold. Although the backbone of the structure is similar to previously characterized family members, sequence comparisons indicate that this family can be further subdivided into two subfamilies with somewhat different fingerprints. NanS is the founding member of group II. Its catalytic center contains Ser19 and His301 but no Asp/Glu is present to form the classical catalytic triad. The contribution of Ser19 and His301 to catalysis was confirmed by mutagenesis. In addition to structural characterization we have mapped the specificity of NanS using a battery of substrates. Structural and enzymatic characterization of NanS (YjhS), a 9-O-acetyl N-acetylneuraminic acid esterase from escherichia coli O157:H7.,Rangarajan ES, Ruane KM, Proteau A, Schrag JD, Valladares R, Gonzalez CF, Gilbert M, Yakunin AF, Cygler M Protein Sci. 2011 May 6. doi: 10.1002/pro.649. PMID:21557376 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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