Adenine Phosphoribosyltransferase in Plant Tissues: Some Effects of Kinetin on Enzymic Activity

Adenine Phosphoribosyltransferase in Plant Tissues: Some Effects of Kinetin on Enzymic Activity

Adenine phosphoribosyltransferase activity was measured in extracts of soybean (Glycine max var. Acme) callus and of senescing barley leaves (Hordeum distichon c.v. Prior). The enzyme from soybean callus had Michaelis constants for adenine and 5-phosphoribosyl pyrophosphate of 1.5 and 7.5 μM respect...

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Veröffentlicht in:Plant physiology (Bethesda) 1968-04, Vol.43 (4), p.645-648
Hauptverfasser: P. B. Nicholls, Murray, A. W.
Format: Artikel
Sprache:eng
Schlagworte:
Barley
Callus
Chlorophylls
Enzyme activity
Enzymes
Plant tissues
Plants
Purines
Soybeans
Tissue culture techniques
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Zusammenfassung:Adenine phosphoribosyltransferase activity was measured in extracts of soybean (Glycine max var. Acme) callus and of senescing barley leaves (Hordeum distichon c.v. Prior). The enzyme from soybean callus had Michaelis constants for adenine and 5-phosphoribosyl pyrophosphate of 1.5 and 7.5 μM respectively and was inhibited by AMP and stimulated by ATP. The presence of kinetin was found to considerably increase the activity of adenine phosphoribosyltransferase in extracts of soybean callus and senescing barley leaves.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.43.4.645