![]() The kinetic parameters of the plant enzyme are broadly similar to those of the bacterial complex, with K m values for glutamine and chorismate of 600 and 1.5 μM respectively. The monomeric enzyme (95 kDa) catalyses two reactions: release of NH 3 from glutamine (glutaminase activity) and substitution of NH 3 for the hydroxy group at position 4 of chorismate (ADC synthase activity). The Arabidopsis enzyme was expressed in E. In Escherichia coli, two proteins forming a heterodimeric complex are required for this reaction, but, in plants and lower eukaryotes, a single protein is involved. It is synthesized in two steps from chorismate and glutamine, the first step being their conversion into glutamate and ADC (4-aminodeoxychorismate). ![]() PABA ( p-aminobenzoate) is a precursor of folates and, besides esterification to glucose, has no other known metabolic fate in plants. Access content during the Covid-19 pandemic. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |