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The cupredoxin fold is found in the soluble Cu A and CyoA domains of two terminal oxidases
Author(s) -
Wittung Pernilla,
Källebring Bruno,
Malmström Bo G.
Publication year - 1994
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(94)00694-6
Subject(s) - plastocyanin , azurin , chemistry , protein subunit , protein secondary structure , cytochrome c oxidase , crystallography , stereochemistry , biochemistry , enzyme , electron transfer , photosystem i , photochemistry , photosystem ii , photosynthesis , gene
The CD spectra of the Cu A domain from subunit II of Paracoccus cytochrome c oxidase and the CyoA domain of subunit II from E. coli quinol oxidase have been recorded in the wavelength region 260‐185 nm. A computer program based on a set of CD spectra of proteins with known structures, and employing the stastistical method of variable selection, has been used to estimate the distribution of five forms of secondary structure. The analysis was improved by including the CD spectra of azurin and plastocyanin in the basis set. For the Cu A domain, an estimate from the primary structure was also made. The results show that the soluble domains have the cupredoxin fold, with very little helical structure and a predominance of β‐strands. The CyoA domain is very similar to azurin, but the β‐structure in the Cu A protein resembles that in plastocyanin.