Quo vadis photorespiration: a tale of two aldolases.
FEBS Letters(1996)
摘要
An O2-consuming side reaction of d-ribulose 1,5-bisphosphate carboxylase causes photorespiration in plants. This reaction may be an inevitable consequence of the enzyme's inability to protect its ene-diolate reaction intermediate from O2, a notion that is supported by the failure of persistent efforts to eliminate selectively its oxygenase activity by genetic manipulation. We have examined two aldolases with similar ene-diolate intermediates, l-rhamnulose 1-phosphate aldolase and l-fuculose 1-phosphate aldolase. The former enzyme has an oxygenase activity, while the latter does not, suggesting that the reaction with O2 is not inevitable.
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关键词
d-Ribulose 1,5-bisphosphate carboxylase/ oxygenase,Photorespiration,l-Rhamnulose 1-phosphate aldolase,l-Fuculose 1-phosphate aldolase,Ene-diol,Oxygenase
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