An effective purification procedure of ribitol dehydrogenase (RDH), a possible new zinc enzyme from Mycobacterium butyricum is described. The procedure took advantage of different chromatographic methods in which the most significant were two affinity chromatography steps. One of them was the immobilized metal ion affinity chromatography (IMAC), with the use of iminodiacetate-Sepharose 6B (IDA-Sepharose 6B) chelating Zn2+ions (IDA-Zn) as an affinity sorbent. The enzyme was eluted with a decreasing pH gradient from 7 to 4. The other step was a biospecific affinity chromatography, where the enzyme retained on 5#x2032; AMP-Sepharose 6B was eluted with 10 mM adenosine 5#x2032;-monophosphate (AMP). RDH was purified 174-fold with 10.2 of recovery, and the final preparation was homogenous in polyacrylamide gel electrophoresis.
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