Jack bean urease: the first nickel enzyme

✍ Scribed by Robert L. Blakeley; Burt Zerner

• Book ID: 104137686
• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 116 KB
• Volume: 79
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(00)95029-1

✦ Synopsis

1st Intern. Conf: on Bioinorganic Chemistry -Session B the 'Bz level with the 'E, levels which yields a triclinic electron distribution.

The 2E, levels admix to the 6Ar ground state by spin-orbit coupling. The electron distribution is therefore predominantly spherically symmetric with a small rhombic component C,,. Ferric low spin Fe in Mb(CN) has for Cd, symmetry a 2E ground state and low lying 'E2 and 4A2 levels at about 300 and 800 cm-'. A triclinic perturbation splits the 2E doublet into 2E+ and the new ground state 2E_. The electron distribution is therefore always of rhombic symmetry C2,.

It is intended to discuss also the symmetry properties of hemes and heme proteins for the 3d6 configuration of Fe.