Pugh ME, Bieber AL. Studies of rabbit brain, intestine and liver guanine aminohydrolase.
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1984;
77:619-27. [PMID:
6713831 DOI:
10.1016/0305-0491(84)90286-4]
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Abstract
Guanine aminohydrolase (EC 3.5.4.3) from rabbit brain, intestine, and liver has been purified to homogeneity by affinity chromatography at room temperature and 0-4 degrees C. In all cases the recovery and fold purification was greatest for purification at room temperature. Each enzyme has a subunit mol. wt of 49,500 and crosslinking studies revealed the native form to be a dimer. The amino acid analysis showed a high content of asx, glx, ser, gly and leu; the pI was 5.0 for each prep. The Michaelis constants at pH 8.0 were 6.1, 6.1 and 5.8 X 10(-6) M for brain, intestine and liver GAH respectively. The enzymes had a broad pH activity profile with an optimum of pH 8.0-8.5.
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