E. coli galactose-1-phosphate uridyl transferase: N-terminal and C-terminal sequences.


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    • Author:  D B Wilson  

    • Abstract:  A modified procedure for the purification of E. coli galactose-1-phosphat e uridyl transferase (E.C. 2.7.6.12) was developed which reproducibly gives pure enzyme. The purified enzyme was shown to be a dimeric protein with a subunit molecular weight of 41,000 and its amino acid composition and content of free sulfhydryl groups were determined. The N-terminal and C-terminal amino acid sequences were found to be NH2-thr-gln-phe-asn- pro-val-asp and -ser(val leu)-ala-COOH respectively. This N-terminal sequence allowed the identification of the start of the transferase gene in the DNA sequence determined by GRINDLEY. Furthermore it appears to define a nine base intercistronic region between the epimerase and transferase genes.

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