PMID: 2492494Jan 1, 1989Paper

Isolation, sequence, and expression in Escherichia coli of an unusual thioredoxin gene from the cyanobacterium Anabaena sp. strain PCC 7120

Journal of Bacteriology
J AlamJ A Fuchs

Abstract

Two sequences with homology to a thioredoxin oligonucleotide probe were detected by Southern blot analysis of Anabaena sp. strain PCC 7120 genomic DNA. One of the sequences was shown to code for a protein with 37% amino acid identity to thioredoxins from Escherichia coli and Anabaena sp. strain PCC 7119. This is in contrast to the usual 50% homology observed among most procaryotic thioredoxins. One gene was identified in a library and was subcloned into a pUC vector and used to transform E. coli strains lacking functional thioredoxin. The Anabaena strain 7120 thioredoxin gene did not complement the trxA mutation in E. coli. Transformed cells were not able to use methionine sulfoxide as a methionine source or support replication of T7 bacteriophage or the filamentous viruses M13 and f1. Sequence analysis of a 720-base-pair TaqI fragment indicated an open reading frame of 115 amino acids. The Anabaena strain 7120 thioredoxin gene was expressed in E. coli, and the protein was purified by assaying for protein disulfide reductase activity, using insulin as a substrate. The Anabaena strain 7120 thioredoxin exhibited the properties of a conventional thioredoxin. It is a small heat-stable redox protein and an efficient protein disulfid...Continue Reading

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Citations

Oct 15, 1992·European Journal of Biochemistry·B WetterauerJ P Jacquot
Feb 1, 1993·European Journal of Biochemistry·M WürfelH Follmann
Sep 14, 2006·Photosynthesis Research·Francisco J FlorencioMarika Lindahl
Dec 1, 1992·European Journal of Biochemistry·P Le MarechalP Decottignies
Jun 1, 1991·European Journal of Biochemistry·P DecottigniesM Miginiac-Maslow
Aug 1, 1997·The New Phytologist·Jean-Pierre JacquotYves Meyer
Apr 14, 1997·Virology·C A Tidona, G Darai
Oct 15, 1995·Structure·M SaarinenH Eklund
May 15, 1991·Archives of Biochemistry and Biophysics·F MarcusB B Buchanan

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