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. 1979 Jun;63(6):1095-7.
doi: 10.1104/pp.63.6.1095.

Cysteinyl-tRNA Synthetase from Astragalus Species

J N Burnell  1
Affiliations

Cysteinyl-tRNA Synthetase from Astragalus Species

J N Burnell. Plant Physiol. 1979 Jun.

Abstract

l-Cysteinyl-tRNA synthetases (EC 6.1.1.16) from four Astragalus species were partially purified. The substrate specificities of the cysteinyl-tRNA synthetase from three selenium accumulator species (A. crotalariae, A bisulcatus, and A. racemosus) were compared with those from two nonaccumulator species (A. lentigenosus and Phaseolus aureus). All species had similar K(m) values for cysteine, selenocysteine, and alpha-aminobutyric acid except A. bisulcatus which failed to use selenocysteine as a substrate and which had a K(m) for cysteine four times greater than the K(m) values for other species.

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References

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