Subunit association of gamma-glutamyltranspeptidase of Escherichia coli K-12.

Subunit association of gamma-glutamyltranspeptidase of Escherichia coli K-12. Research Abstract Details 

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Subunit association of gamma-glutamyltranspeptidase of Escherichia coli K-12. Abstract Text:

W Hashimoto,H Suzuki,S Nohara,H Tachi,K Yamamoto,H Kumagai,

gamma-Glutamyltranspeptidase [EC 2.3.2.2] of Escherichia coli K-12 consists of one large subunit and one small subunit, which can be separated from each other by high-performance liquid chromatography. Using ion spray mass spectrometry, the masses of the large and the small subunit were determined to be 39,207 and 20,015, respectively. The large subunit exhibited no gamma-glutamyltranspeptidase activity and the small subunit had little enzymatic activity, but a mixture of the two subunits showed partial recovery of the enzymatic activity. The results of native-polyacrylamide gel electrophoresis suggested that they could partially recombine, and that the recombined dimer exhibited enzymatic activity. The gene of gamma-glutamyltranspeptidase encoded a signal peptide, and the large and small subunits in a single open reading frame in that order. Two kinds of plasmid were constructed encoding the signal peptide and either the large or the small subunit. A gamma-glutamyltranspeptidase-less mutant of E. coli K-12 was transformed with each plasmid or with both of them. The strain harboring the plasmid encoding each subunit produced a small amount of the corresponding subunit protein in the periplasmic space but exhibited no enzymatic activity. The strain transformed with both plasmids together exhibited the enzymatic activity, but its specific activity was approximately 3% of that of a strain harboring a plasmid encoding the intact structural gene. These results indicate that a portion of the separated large and small subunits can be reconstituted in vitro and exhibit the enzymatic activity, and that the expressed large and small subunits independently are able to associate in vivo and be folded into an active structure, though the specific activity of the associated subunits was much lower than that of native enzyme. This suggests that the synthesis of gamma-glutamyltranspeptidase in a single precursor polypeptide and subsequent processing are more effective to construct the intact structure of gamma-glutamyltranspeptidase than the association of the separated large and small subunits.

Subunit association of gamma-glutamyltranspeptidase of Escherichia coli K-12. Publishing Authors By Initials

W Hashimoto,H Suzuki,S Nohara,H Tachi,K Yamamoto,H Kumagai,

For similar enzymes and coenzymes: enzymes: transferases: acyltransferases: aminoacyltransferases: gamma-glutamyltransferase research abstracts see: enzymes and coenzymes: enzymes: transferases: acyltransferases: aminoacyltransferases: gamma-glutamyltransferase research

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Subunit association of gamma-glutamyltranspeptidase of Escherichia coli K-12. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of biochemistry

VOLUME: 118

Page Numbers: 1216-23

Journal Abbreviation: J. Biochem.

ISSN: 0021-924X

DAY: 19

MONTH: Dec

YEAR: 1995

Subunit association of gamma-glutamyltranspeptidase of Escherichia coli K-12. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 376600

Subunit association of gamma-glutamyltranspeptidase of Escherichia coli K-12. Keywords Mesh Terms:

KEYWORDS: gamma-Glutamyltransferase

MESH TERMS: metabolism

Chemical & Substance for Abstract: Subunit association of gamma-glutamyltranspeptidase of Escherichia coli K-12. Information

Substance Name: gamma-Glutamyltransferase

Registry Number: EC 2.3.2.2

Grant and Affiliation Information for Subunit association of gamma-glutamyltranspeptidase of Escherichia coli K-12.

AFFILIATION: Department of Food Science and Technology, Kyoto University.

Country: JAPAN

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MEDLINETA: J Biochem

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