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. 1979 Sep 1;181(3):517–524. doi: 10.1042/bj1810517

Structural aspects of the dye-linked alcohol dehydrogenase of Rhodopseudomonas acidophila.

C W Bamforth, J R Quayle
PMCID: PMC1161190  PMID: 229820

Abstract

1. A dye-linked alcohol dehydrogenase was purified 60-fold from extracts of Rhodopseudomonas acidophila 10050 grown aerobically on ethanol. 2. The properties of this enzyme were identical with those of the alcohol dehydrogenase synthesized by this organism during growth on methanol anaerobically in the light, and they are judged to be the same enzyme. 3. The enzyme gave a single protein band, coincident with alcohol dehydrogenase activity, during electrophoresis on polyacrylamide gel. 4. The amino acid composition, ioselectric point, u.v. and visible absorption spectra of the enzyme were determined and compared with those of other similar enzymes. 5. The presence of 0.7--1.0 g-atom of non-haem, acidlabile iron/mol of enzyme was shown by atomic absorption spectrophotometry and colorimetric assay. The iron could not be dissociated from the enzyme by dialysis against chelating agents. 6. E.p.r. spectroscopy of the enzyme did not indicate any redox function for the iron during alcohol dehydrogenation, but showed a signal at g = 2.00 consistent with the presence of a protein-bound organic free radical. 8. Antisera were raised against alcohol (methanol) dehydrogenases purified from Rhodopseudomonas acidophila, Paracoccus denitrificans and Methylophilus methylotrophus. 9. The antiserum to the Rhodopseudomonas acidophila enzyme cross-reacted with neither of the two other antisera, nor with crude extracts of methanol-grown Hyphomicrobium X and Pseudomonas AM1, thus emphasizing its singular biochemical properties.

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Selected References

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