Abstract
An improved synthesis of the 8-(6-aminohexyl)amino derivative of NADP+ is described for use in affinity chromatography. The binding of glutamate dehydrogenase isolated from halobacterium of the Dead Sea on a column of Sepharose linked to this NADP+ derivative could be drastically enhanced by addition of sulfate (1 M) and provided a tool for partially purifying the enzyme from a crude extract. A similar finding is reported for glucose-6-phosphate dehydrogenase in crude extracts of E.coli. The effects are biospecific, suggesting that the strength of the interaction between protein and immobilized coenzymes is a function of the sulfate concentration.