Abstract:
:Phosphoenolpyruvate carboxylase purified from leaves of maize (Zea mays, L.) is sensitive to the presence of urea. Exposure to 2.5 m urea for 30 min completely inactivates the enzyme, whereas for a concentration of 1.5 m urea, about 1 h is required. Malate appears to have no effect on inactivation by urea of phosphoenolpyruvate carboxylase. However, the presence of 20 mm phosphoenolpyruvate or 20 mm glucose-6-phosphate prevents significant inactivation by 1.5 m urea for at least 1 h. The inactivation by urea is reversible by dilution. The inhibition by urea and the protective effects of phosphoenolpyruvate and glucose-6-phosphate are associated with changes in aggregation state.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Wedding RT,Dole P,Chardot TP,Wu MXdoi
10.1104/pp.100.3.1366subject
Has Abstractpub_date
1992-11-01 00:00:00pages
1366-8issue
3eissn
0032-0889issn
1532-2548journal_volume
100pub_type
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