Primary structure and catalytic properties of a cold-active esterase from a psychrotroph, acinetobacter sp. strain no. 6. isolated from siberian soil

Takeshi Suzuki, Toru Nakayama, Tatsuo Kurihara, Tokuzo Nishino, Nobuyoshi Esaki

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

We cloned a gene coding for a cold-active esterase from a genomic library of Acinetobacter sp. strain No. 6, a psychrotroph isolated from Siberian soil. The gene, aest, encoded a protein of 301 amino acid residues, the deduced sequence of which had less than 17% identity to sequences of known esterases and lipases. However, the esterase seemed to belong to the α/β hydrolase superfamily, because it contained a sequence, Gly-Xaa-Ser-Xaa-Gly (with Xaa an arbitrary amino acid residue), found in most serine hydrolases of this superfamily. Sequence comparison earlier suggested a weak phylogenetic relationship of gene product AEST to the EST group of the esterase-lipase family, which has been found only in eukaryotes. The aest gene was expressed in Escherichia coli BL21(DE3) cells under the control of the T7 promoter, and the expression product was purified to homogeneity and characterized. It catalyzed the hydrolysis of esters with short-chain acyl groups and had lower activation energy and lower thermostability than do mesophilic enzymes, as expected from the cold-adapted nature of this enzyme.

Original languageEnglish
Pages (from-to)1682-1690
Number of pages9
JournalBioscience, Biotechnology and Biochemistry
Volume66
Issue number8
DOIs
Publication statusPublished - 2002 Jan 1

Keywords

  • Cold-active
  • Esterase
  • Prokaryotic
  • Psychrotroph
  • Superfamily

ASJC Scopus subject areas

  • Biotechnology
  • Analytical Chemistry
  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Molecular Biology
  • Organic Chemistry

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