Identification of the amino acid residues responsible for cold tolerance in Flaveria brownii pyruvate,orthophosphate dikinase.
Pyruvate,orthophosphate dikinase (PPDK), an enzyme important in C4 photosynthesis, is typically a cold-sensitive enzyme. However, a cold-tolerant form of the enzyme has been isolated from the leaves of Flaveria brownii. Using an Escherichia coli expression system and the PPDK cDNAs from F. brownii (cold-tolerant), F. bidentis (cold-sensitive) and maize (intermediate cold tolerance), site-directed mutagenesis studies indicated that as few as three amino acids residues (of 880 residues) strongly influence the cold sensitivity of Flaveria PPDK. Gel filtration analysis of the PPDK expressed in E. coli showed that subunit association and cold tolerance are closely linked.
Plant Breeding and Genetics Research Laboratory, Japan Tobacco Inc., Iwata, Shizuoka, Japan.
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Ohta
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Usami
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Ueki
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Kumashiro
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Komari
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Burnell
D000595:Amino Acid Sequence; D003080:Cold Temperature; D004795:Enzyme Stability; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D010944:Plants / Q000201:enzymology*; D011772:Pyruvate, Orthophosphate Dikinase / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000378:metabolism
D011993:Recombinant Fusion Proteins; D011772:Pyruvate, Orthophosphate Dikinase