Abstract
A Chlamydomonas reinhardtii molybdenum cofactor (MoCo)-carrier protein (CP), capable of reconstituting nitrate reductase activity with apoprotein from the Neurospora crassa mutant nit-1, was subjected to experiments of diffusion through a dialysis membrane and gel filtration. CP bonded firmly MoCo and did not release it efficiently unless aponitrate reductase was present in the incubation mixture, Stability of MoCo bound to CP against air and heat was very similar to that of free-MoCo released from milk xanthine oxidase. Our data strongly suggest that MoCo is directly transferred from CP to aponitrate reductase to form an active enzyme.
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