Abstract
Fructose-1,6-bisphosphatases (EC 3.1.3.11) isolated from rabbit liver and kidney appear to have identical primary structures, as deduced from their tryptic peptide maps and the peptide patterns obtained after cleavage with cyanogen bromide and chromatography on Sephadex G75. The enzyme isolated from rabbit skeletal muscle, on the other hand, yields distinctly different fingerprints and cyanogen bromide cleavage products. The results indicate that animal cells possess two genes that code for fructose-bisphosphatase. Native rabbit liver fructose bisphosphatase contains a single tryptophan located near the NH 2-terminus, and the NH 2 terminal-BrCN peptide containing this residue has been identified in the Sephadex G75 filtrates.
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