Preliminary X-ray crystallographic study of amicyanin from Paracoccus denitrificans

Single crystals have been prepared of Paracoccus denitrificans amicyanin, a blue copper protein that serves as an electron acceptor for methylamine dehydrogenase. The crystals belong to the monoclinic space group P2(1), and have unit cell parameters a = 20.90 A, b = 56.61 A, c = 27.55 A and beta = 96.41. There is one molecule in the asymmetric unit. The crystals diffract to beyond 1.5 A resolution.