Characterization of the molybdenum cofactor of sulfite oxidase, xanthine, oxidase, and nitrate reductase. Identification of a pteridine as a structural component.

This is the authors' abstract. We don't add key points for this paper.

The molybdenum cofactor has been isolated in an oxidized inactive form from purified molybdoenzymes. The isolated material is shown to be a novel pterin. The active cofactor is presumably composed of molybdenum and a reduced form of the pterin.