CDA (Cytidine deaminase) is an enzyme that scavenges exogenous and endogenous cytidine and 2- deoxycytidine for UMP synthesis. This protein is one of several deaminases responsible for maintaining the cellular pyrimidine pool. The protein also catalyzes the deamination of chemotherapeutic cytosine nucleoside analogs such as Ara-C and 5-azacytidine, which results in the loss of their cytotoxic and antitumor function. It can form homotetramers and is mainly expressed in granulocytes. Source: Recombinant protein corresponding to aa1-146 from human CDA, fused to His-tag at N-terminal expressed in E. coli. Molecular Weight: ~18.3kD (166aa) Specific Activity: >3.5unit/mg, in which one unit of activity was defined as the amount required to deaminate 1umole of cytidine/min at pH 7.5 and 25C. Amino Acid Sequence: MGSSHHHHHH SSGLVPRGSH MAQKRPACTL KPECVQQLLV CSQEAKQSAY CPYSHFPVGA ALLTQEGRIF KGCNIENACY PLGICAERTA IQKAVSEGYK DFRAIAIASD MQDDFISPCG ACRQVMREFG TNWPVYMTKP DGTYIVMTVQ ELLPSSFGPE DLQKTQ Storage and Stability: May be stored at 4C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20C. Aliquots are stable for 6 months after receipt at -20C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.
