Primary structure of the Synechococcus PCC 7942 PAPS reductase gene |
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Authors: | Andrea Niehaus Günther Gisselmann Jens D Schwenn |
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Institution: | (1) Biochemistry of Plants, Faculty of Biology, Ruhr University Bochum, P.O. Box 102148, 4630 Bochum 1, Germany |
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Abstract: | The structural gene encoding a thioredoxin-dependent 5 -phosphoadenylyl sulphate (PAPS) reductase (EC 1.8.4.-) from cyanobacterium Synechococcus PCC 7942 ( Anacystis nidulans ) was detected by heterologous hybridization with the cysH gene from Escherichia coli K12. The cyanobacterial gene (further called par gene) comprised 696 nt which are 57.8% homologous to the enterobacterial gene. The putative open reading frame encoded a polypeptide consisting of 232 amino acid residues (deduced molecular weight 26635) which showed significant homologies to the polypeptide from E. coli (50.8%) and to the polypeptide from Saccharomyces cerevisiae (30.3%). A single cysteine located at the C-terminus of the polypeptide of E. coli (Cys239) was conserved in Synechococcus. Conservation of this cysteinyl residue seems indispensable for catalysis. Complementation of a cysH-deficient mutant of E. coli by the cyanobacterial gene indicated that the cloned DNA is the structural gene of the PAPS reductase.Abbreviations IPTG
isopropyl-1-thio- -D-galactoside
- PAPS
3 -phosphoadenosine-5 -phosposulphate |
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Keywords: | assimilatory sulphate reduction cyanobacteria cysteine biosynthesis DNA sequence phospho-adenylyl sulphate reductase Synechococcus PCC 7942 |
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