Acetylpolyamine amidohydrolase from Mycoplana ramosa: Gene cloning and characterization of the metal-substituted enzyme

Kazuhiro Sakurada, Toshio Ohta, Kinya Fujishiro, Mamoru Hasegawa, Kazuo Aisaka

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

We have cloned a gene (aphA) encoding aeetylpolyamine amidohydrolase from Mycoplana ramosa ATCC 49678 (previously named Mycoplana bullata). A genomic library of M. ramosa was screened with an oligonucleotide probe designed from a N-terminal amino acid sequence of the enzyme purified from M. ramosa. Nucleotide sequence analysis revealed an open reading frame of 1,023 bp which encodes a polypeptide with a molecular mass of 36,337 Da. This is the first report of the structure of acetylpolyamine amidohydrolase. The aphA gene was subcloned under the control of the trc promoter and was expressed in Escherichia coli MM294. The recombinant enzyme was purified, and the enzymatic properties were characterized. Substrate specificities, K(m) values, and V(max) values were identical to those of the native enzyme purified from M. ramosa. In the analysis of the metal-substituted enzymes, we found that the acid limb of pH rate profiles shifts from 7.2 for the original zinc enzyme to 6.6 for the cobalt enzyme. This change suggests that the zinc atom is essential for the catalytic activity of the enzyme similarly to the zinc atom in carboxypeptidase A.

Original languageEnglish
Pages (from-to)5781-5786
Number of pages6
JournalJournal of Bacteriology
Volume178
Issue number19
DOIs
Publication statusPublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

Fingerprint

Dive into the research topics of 'Acetylpolyamine amidohydrolase from Mycoplana ramosa: Gene cloning and characterization of the metal-substituted enzyme'. Together they form a unique fingerprint.

Cite this