Open AccessCloning, recombinant production, crystallization and preliminary X‐ray diffraction analysis of a family 101 glycoside hydrolase from Streptococcus pneumoniae
Author(s) -
Gregg Katie J.,
Boraston Alisdair B.
Publication year - 2009
Publication title -
acta crystallographica section f
Language(s) - English
Resource type - Journals
ISSN - 1744-3091
DOI - 10.1107/s1744309108042474
Subject(s) - recombinant dna , streptococcus pneumoniae , cloning (programming) , crystallization , microbiology and biotechnology , glycoside hydrolase , biology , chemistry , gene , genetics , organic chemistry , antibiotics , computer science , programming language
Streptococcus pneumoniae is a serious human pathogen that is responsible for a wide range of diseases including pneumonia, meningitis, septicaemia and otitis media. The full virulence of this bacterium is reliant on carbohydrate processing and metabolism, as revealed by biochemical and genetic studies. One carbohydrate‐processing enzyme is a family 101 glycoside hydrolase ( Sp GH101) that is responsible for catalyzing the liberation of galactosyl β1,3‐ N ‐acetyl‐ d ‐galactosamine (Galβ1,3GalNAc) α‐linked to serine or threonine residues of mucin‐type glycoproteins. The 124 kDa catalytic module of this enzyme ( Sp GH101CM) was cloned and overproduced in Escherichia coli and purified. Crystals were obtained in space group P 2 1 and diffracted to 2.0 Å resolution, with unit‐cell parameters a = 81.86, b = 88.91, c = 88.77 Å, β = 112.46°. Sp GH101CM also qualitatively displayed good activity towards the synthetic substrate p ‐nitrophenyl‐2‐acetamido‐2‐deoxy‐3‐ O ‐(β‐ d ‐galactopyranosyl)‐α‐ d ‐galactopyranoside, which is consistent with the classification of this enzyme as an endo‐α‐ N‐ acetylgalactosaminidase.