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Regulation of enzymes involved in the sulphur‐assimilatory pathway
Author(s) -
Hawkesford Malcolm J.,
Schneider Andrea,
Belcher Ann R.,
Clarkson David T.
Publication year - 1995
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19951580110
Subject(s) - enzyme , cysteine , biochemistry , sulfur , assimilation (phonology) , chemistry , atp synthase , psychological repression , enzyme assay , biosynthesis , gene , gene expression , linguistics , philosophy , organic chemistry
The regulation of enzymes involved in sulphate assimilation in plants has been investigated. Extractable activity of ATP sulphurylase (the first enzyme of the assimilatory pathway) has been shown to be regulated by sulphate availability and O‐acctylserine (OAS) supply. OAS addition to the medium increased extractable activity and was able, at least partially, to overcome the repression of extraclable activity observed by supply of sulphate and cysteine. Cysteine synthase, the final enzyme of the cysteine biosynthetic pathway, was not regulated under these conditions.