PMID:6130097: Difference between revisions
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|{{TableHeadingColor}} nowrap |'''Links''' || [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=6130097 PubMed] | |{{TableHeadingColor}} nowrap |'''Links''' || [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=6130097 PubMed] | ||
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Revision as of 22:43, 25 April 2008
Garcia, E and Rhee, SG (1983) Cascade control of Escherichia coli glutamine synthetase. Purification and properties of PII uridylyltransferase and uridylyl-removing enzyme.J. Biol. Chem. 258:2246-53
| Abstract | Uridylyltransferase, a component of the covalent modification cascade system that controls glutamine synthetase activity in Escherichia coli, has been purified to apparent homogeneity. The purification was facilitated by the use of an E. coli strain which carries multiple copies of a ColE1-hybrid plasmid containing the glnD gene that encodes uridylyltransferase and which overproduces its synthesis by 25-fold. Gel electrophoresis and high pressure liquid chromatography studies show that the native enzyme is a single polypeptide chain of Mr = 95,000 +/- 5,000. The purified enzyme catalyzes the uridylylation as well as the deuridylylation of the regulatory protein PII, demonstrating that a single bifunctional enzyme is involved in the covalent interconversion of PII. Gel filtration studies indicate that the enzyme undergoes slow irreversible aggregation during most steps of purification with a concomitant loss of activity. |
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