Purity ~90% (SDS-PAGE). GDA is an enzyme responsible for the hydrolytic deamination of guanine. Studies in rat ortholog suggest this gene plays a role in microtubule assembly. Multiple transcript variants encoding different isoforms have been found for this gene. Recombinant human GDA protein, fused to His-tag at N-terminus, was expressed in E. coli and purified by using conventional chromatography techniques. Source: Recombinant protein corresponding to aa1-454 and 477aa of human GDA, fused to His-tag at N-terminal expressed in E. coli. Molecular Weight: ~53kD Specific Activity: >0.9unit/ml Unit Definition: One unit will deaminate 1.0umole of guanine to xanthine per minute at pH 8.0 at 25°C. AA