✦ LIBER ✦

Electron paramagnetic resonance spectrum of crystalline jack bean urease

✍ Scribed by Zofia I. Olech

Book ID: 103966930
Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 212 KB
Volume: 72
Category: Article
ISSN: 0927-7757
DOI: 10.1016/0927-7757(93)80486-x

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✦ Synopsis

X-band electron paramagnetic resonance (EPR) spectra of polycrystalline urease were recorded at room and liquid nitrogen temperatures. They are a superposition of narrow isotropic and broad anisotropic signals. Analysis of the spectra indicates that most Ni 2+ ions in the enzyme interact in pairs (antiferromagnetic exchange coupling). The interactions cause deformation of ion coordination, which is reflected in the anisotropy of the EPR signal from Ni 2 + ion pairs. The remaining Ni 2 t ions, of nearly Oh coordination, are isolated.

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