title: An extended-X-ray-absorption-fine-structure (e.x.a.f.s.) study of coenzyme F430 from Methanobacterium thermoautotrophicum.
abstract: Coenzyme F430 is a nickel porphinoid found in all methanogenic bacteria. Extended-X-ray-absorption-fine-structure (e.x.a.f.s.) spectra have been recorded above the nickel K-edge of coenzyme F430 and two model compounds, (5,10,15,20-tetramethylporphinato) nickel(II) and (5,10,15,20-tetramethylchlorinato)-nickel(II). The results show that the four nickel-nitrogen distances in F430 are split, with two nitrogen atoms at 0.192 nm and two at 0.210 nm.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D019605:Euryarchaeota / Q000032:analysis*; D008665:Metalloporphyrins; D008667:Metalloproteins; D009532:Nickel / Q000032:analysis; D013057:Spectrum Analysis; D014965:X-Rays
chemical_list: D008665:Metalloporphyrins; D008667:Metalloproteins; C023540:factor F430; D009532:Nickel