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PLANT PHYSIOLOGY , Vol 105, Issue 3 897-902, Copyright © 1994 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Cloning of a cDNA Encoding ATP Sulfurylase from Arabidopsis thaliana by Functional Expression in Saccharomyces cerevisiae
T. Leustek, M. Murillo and M. Cervantes
Center for Agricultural Molecular Biology, Rutgers University, New Brunswick, New Jersey 08903
ATP sulfurylase, the first enzyme in the sulfate assimilation pathway of
plants, catalyzes the formation of adenosine phosphosulfate from ATP and
sulfate. Here we report the cloning of a cDNA encoding ATP sulfurylase
(APS1) from Arabidopsis thaliana. APS1 was isolated by its ability to
alleviate the methionine requirement of an ATP sulfurylase mutant strain of
Saccharomyces cerevisiae (yeast). Expression of APS1 correlated with the
presence of ATP sulfurylase enzyme activity in cell extracts. APS1 is a
1748-bp cDNA with an open reading frame predicted to encode a 463-amino
acid, 51,372-D protein. The predicted amino acid sequence of APS1 is
similar to ATP sulfurylase of S. cerevisiae, with which it is 25%
identical. Two lines of evidence indicate that APS1 encodes a chloroplast
form of ATP sulfurylase. Its predicted amino-terminal sequence resembles a
chloroplast transit peptide; and the APS1 polypeptide, synthesized in
vitro, is capable of entering isolated intact chloroplasts. Several genomic
DNA fragments that hybridize with the APS1 probe were identified. The APS1
cDNA hybridizes to three species of mRNA in leaves (1.85, 1.60, and 1.20
kb) and to a single species of mRNA in roots (1.85 kb).
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