title: Single amino acid substitution between SHV-1 beta-lactamase and cefotaxime-hydrolyzing SHV-2 enzyme.
abstract: SHV-2 beta-lactamase was purified from an overproducing variant of a clinical isolate of Escherichia coli resistant to cefotaxime. Pure protein was digested by trypsin and Lys-C endoproteinase. Proteolytic peptides, isolated by reverse-phase HPLC, were submitted to manual Edman degradation and aligned by homology with the sequence of SHV-1 beta-lactamase. A putative amino acid sequence was deduced. Structural comparison revealed that SHV-2 differed from SHV-1 by only one amino acid, Gly----Ser, at position 213 of the mature protein.
mesh_terms: D000595:Amino Acid Sequence; D002439:Cefotaxime / Q000378:metabolism*; D004926:Escherichia coli / Q000201:enzymology*; D005998:Glycine; D007527:Isoenzymes / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D008969:Molecular Sequence Data; D012694:Serine; D001618:beta-Lactamases / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D007527:Isoenzymes; D012694:Serine; D001618:beta-Lactamases; D002439:Cefotaxime; D005998:Glycine