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. 1997 Aug;114(4):1169–1175. doi: 10.1104/pp.114.4.1169

High-yield expression of pea thioredoxin m and assessment of its efficiency in chloroplast fructose-1,6-bisphosphatase activation.

J López Jaramillo 1, A Chueca 1, J P Jacquot 1, R Hermoso 1, J J Lázaro 1, M Sahrawy 1, J López Gorgé 1
PMCID: PMC158409  PMID: 9276945

Abstract

A cDNA clone encoding pea (Pisum sativum L.) chloroplast thioredoxin (Trx) m and its transit peptide were isolated from a pea cDNA library. Its deduced amino acid sequence showed 70% homology with spinach (Spinacia oleracea L.) Trx m and 25% homology with Trx f from pea and spinach. After subcloning in the Ndel-BamHI sites of pET-12a, the recombinant supplied 20 mg Trx m/L. Escherichia coli culture. This protein had 108 amino acids and was 12,000 D, which is identical to the pea leaf native protein. Unlike pea Trx f, pea Trx m showed a hyperbolic saturation of pea chloroplast fructose-1,6-bisphosphatase (FBPase), with a Trx m/ FBPase molar saturation ratio of about 60, compared with 4 for the Trx f/FBPase quotient. Cross-experiments have shown the ability of pea Trx m to activate the spinach chloroplast FBPase, results that are in contrast with those in spinach found by P. Schürmann, K. Maeda, and A. Tsugita ([1981] Eur J Biochem 116: 37-45), who did not find Trx m efficiency in FBPase activation. This higher efficiency of pea Trx m could be related to the presence of four basic residues (arginine-37, lysine-70, arginine-74, and lysine-97) flanking the regulatory cluster; spinach Trx m lacks the positive charge corresponding to lysine-70 of pea Trx m. This has been confirmed by K70E mutagenesis of pea Trx m, which leads to a 50% decrease in FBPase activation.

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Selected References

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