Calreticulin is the major calcium binding protein found in smooth muscle sarcoplasmic reticulum (SR) and non-muscle endoplasmic reticulum (ER) membranes. Calreticulin can inhibit the binding of androgen receptor to its hormone-responsive DNA element and can inhibit androgen receptor and retinoic acid receptor transcriptional activities in vivo, as well as retinoic acid-induced neuronal differentiation. Thus, Calreticulin can act as an important modulator of the regulation of gene transcription by nuclear hormone receptors. Recombinant human Calreticulin protein, fused to His-tag at N-terminus, was expressed in E.coli and purified by using conventional chromatography techniques. Synonyms: cC1qR, CRT, FLJ26680, RO, SSA, Autoantigen RO, CALR, CALR protein, Calregulin, Calreticulin, CRP55, CRTC, ERp60, FLJ26680, grp60, HACBP, Sicca syndrome antigen A. NCBI no.: NP_004334