title: N-terminal amino-acid sequence of beta-lactamase from Shigella flexneri UCSF-129.
abstract: A beta-lactamase (EC 3.5.2.6 penicillinase, penicillin amino beta-lactam-hydrolase) was purified from Shigella flexneri USCF-129 by an efficient two-stage procedure involving chromatography in Sephadex G-75 and HPLC on a C18-reverse phase column. The homogeneity of the purified enzyme was confirmed by capillary zone electrophoresis (CZE), HPLC electrospray mass spectrometry (LC-ESMS) and amino acid sequence analyses. The highly purified enzyme was a monomeric protein with a molecular mass of 28.903 +/- 2 Da, as determined by LC-ESMS. The amino acid sequence of the first 49 N-terminal residues of this beta-lactamase revealed 100% similarity with the mature forms of the plasmid coded Escherichia coli enzymes (plasmid pBR 322 and R6K) a TEM-type beta-lactamase.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D017386:Sequence Homology, Amino Acid; D012763:Shigella flexneri / Q000201:enzymology*; D001618:beta-Lactamases / Q000737:chemistry*
chemical_list: D000596:Amino Acids; D001618:beta-Lactamases