Bryant JA, Greenway SC, West GA. Iso-enzymes of acid ribonuclease in cotyledons of Pisum sativum L.
PLANTA 1976;
130:141-144. [PMID:
24424590 DOI:
10.1007/bf00384411]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/1975] [Accepted: 01/14/1976] [Indexed: 06/03/2023]
Abstract
Acid ribonuclease from cotyledons of Pisum sativum is very stable, with a temperature optimum of 65° C. It has a molecular weight of 17,500 and there is evidence that a fragment, with a molecular weight of 3,100, retains enzyme activity. Acid ribonuclease from the cotyledons of five-day old seedlings may be fractionated into two iso-enzymes, I and II, by CM-cellulose chromatography. The increase in activity of iso-enzyme I is not inhibited by cycloheximide, whereas the increase in iso-enzyme II activity is strongly inhibited by cycloheximide. Cotyledons of 9-day old seedlings contain only iso-enzyme I, whilst cotyledons of 15-day old seedlings contain three iso-enzymes, I, IIa and III.
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