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Ab initio g-tensor calculations of the thioether substituted tyrosyl radical in galactose oxidase
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Linkoping Univ, Inst Phys & Measurement Technol, SE-58183 Linkoping, Sweden Univ Stockholm, Dept Phys, SE-11385 Stockholm, Sweden Royal Inst Technol, SE-10044 Stockholm, Sweden.
Linkoping Univ, Inst Phys & Measurement Technol, SE-58183 Linkoping, Sweden Univ Stockholm, Dept Phys, SE-11385 Stockholm, Sweden Royal Inst Technol, SE-10044 Stockholm, Sweden.
2000 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 319, no 3-4, 191-196 p.Article in journal (Refereed) Published
Abstract [en]

The tyrosyl radical in galactose oxidase is covalently cross-linked to a neighboring cysteine residue through a thioether bond. The role of this sulfur cross-link has been discussed ever since the crystal structure of the enzyme was solved. In the present work, the ab initio multiconfigurational linear response method is applied to calculate the g-tensor of unsubstituted and thioether substituted phenoxyl radicals. In contrast to some previous interpretations, but in agreement with recent EPR measurements, we find that the sulfur substitution induces only minor shifts in the g-tensor components. The spin distribution retains the odd-alternant pattern of the unsubstituted radical and only a small amount of spin is localized to the sulfur center. (C) 2000 Elsevier Science B.V. All rights reserved.

Place, publisher, year, edition, pages
2000. Vol. 319, no 3-4, 191-196 p.
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Natural Sciences
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URN: urn:nbn:se:liu:diva-49822OAI: oai:DiVA.org:liu-49822DiVA: diva2:270718
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2013-11-08

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Engstrom, Maria

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