Abstract:
:An open reading frame of 828 base pairs was found in the CHO1 gene region of Saccharomyces cerevisiae by nucleotide sequencing analysis. Its enhanced expression with the aid of the PHO5 regulatory sequence resulted in an overproduction of a protein with a molecular weight of approximately 30,000, which in turn was converted by proteolysis to active phosphatidylserine synthase, whose molecular weight was approximately 23,000. The larger protein was concluded to be the primary product of the CHO1 gene, since its amino-terminal sequence was identical to that deduced from the nucleotide sequence of the above open reading frame, except for the terminal methionine residue. A partial homology in primary structures was noticed between this yeast enzyme and phosphatidylglycerophosphate synthase of Escherichia coli which also uses CDP-diacylglycerol as a substrate. The overproduced phosphatidylserine synthase in both microsomal and extensively purified fractions displayed two different Km values for L-serine, i.e., 0.14 mM at low L-serine concentrations and 9.5 mM at high L-serine concentrations. This may indicate a negatively cooperative regulation of this enzyme activity or the presence of two active components with different affinities for L-serine.
journal_name
J Biochemjournal_title
Journal of biochemistryauthors
Kiyono K,Miura K,Kushima Y,Hikiji T,Fukushima M,Shibuya I,Ohta Adoi
10.1093/oxfordjournals.jbchem.a122147subject
Has Abstractpub_date
1987-11-01 00:00:00pages
1089-100issue
5eissn
0021-924Xissn
1756-2651journal_volume
102pub_type
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a121806
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更新日期:1986-04-01 00:00:00
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pub_type: 杂志文章
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更新日期:2007-02-01 00:00:00