J. Biochem, 1998, Vol. 123, No. 6 1112-1118
© 1998 Japanese Biochemical Society
research-article |
Properties, Sequence, and Synthesis in Escherichia coli of 1-Aminocyclopropane-l-Carboxylate Deaminase from Hansenula saturnus
Faculty of Agriculture, Hokkaido University kita 9 nishi 9, Kita-ku, Sapporo 060-8589
1To whom correspondence should be addressed. Tel: +81-11-706-2497, Fax: +81-11-706-3635, E-mail: mmrhonma{at}chem.agr.hokudai.ac.jp
The plant hormone ethylene is generated from a unique precursor, 1-aminocyclopropane-1-carboxylate (ACC). In previous studies, ACC deaminase, which degrades ACC to
-ketobutyrate and ammonia, was found in four strains of Pseudomonas, characterized, and sequenced. To verify the wider distribution of ACC deaminase in microorganisms, we purified and sequenced ACC deaminase from the yeast Hansenula saturnus. The purified enzyme was active toward ACC, D-serine and dl-coronamic acid, indicating the same stereospecificity as the Pseudomonas enzyme, but unlike the bacterial enzyme it was not active toward ß-chloro-D-alanine and O-acetyl-D-serine. Analyses of peptides from proteolytic digests of the purified and modified ACC deaminase covered more than 90% of its amino acid sequence and showed a blocked N-terminal residue as N-acetylserine. A cDNA encoding the ACC deaminase was isolated from H. saturnus cells incubated in
-aminoisobutyrate medium, and sequenced. The yeast enzyme has 441 amino acid residues, of which 60 to 63% are identical to those of reported Pseudomonas enzymes. The open reading frame encoding ACC deaminase was subcloned into pET-11d and expressed in Escherichia coli BL21 (DE3) as an active enzyme.
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