Abstract
Factor 430 (F430) is a Ni(II) tetrapyrrole (corphin) found in methyl coenzyme M reductase, the enzyme catalyzes the terminal stages of the conversion of carbon dioxide in methane biogenesis. The authors present here EXAFS results for the low-spin (LS) Ni(II) form of F430 M{sup 10} and for its paramagnetic Ni(I) reduction intermediate. The significant differences in Ni-N bond lengths found for the low- and high-spin Ni(II), 1.90 vs. 2.10 {angstrom}, demonstrate the considerable conformational flexibility of the F430 skeleton.
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