α-Glucan phosphorylate from Escherichia coli. Cloning of the gene, and purification and characterization of the protein

F. Yu, Y. Jen, E. Takeuchi, M. Inouye, H. Nakayama, M. Tagaya, T. Fukui

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Abstract

By using a synthetic olgionucleotide probe identical to a part of the gene for the Escherichia coli major outer membrane lipoprotein, we have cloned a gene from E. coli chromosomal DNA. However, the cloned gene was not one of the lipoprotein genes. The amino acid sequence deduced from its nucleotide sequence shows extensive similarities instead to α-glucan phosphorylase (EC 2.4.1.1). The gene, glgP, is located immediately downstream from glgA, the gene for glycogen synthase. The glgP gene was inserted into pUC9 vector and expressed in the presence of the lac inducer. The gene product was purified to apparent homogeneity as shown by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. In all chromatographies, the protein was eluted accompanied by a low phosphorylase activity. The final preparation showed phosphorolytic activity to various α-glucans, although the specific activity was extremely low compared to other α-glucan phosphorylases under the standard assay conditions. Its enzyme activity, however, increased almost linearly as the concentration of glucan increased, reaching a value comparable with those of other phosphorylases. The amino acid sequence deduced was compared with those of α-glucan phosphorylases from other sources.

Original languageEnglish (US)
Pages (from-to)13706-13711
Number of pages6
JournalJournal of Biological Chemistry
Volume263
Issue number27
StatePublished - 1988

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Biochemistry
  • Cell Biology

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