Small nuclear ribonucleoprotein polypeptide G, also known as SNRPG, belongs to the snRNP Sm proteins family. There are at least seven isoforms, B/B, E, F, G, D1, D2, and D3. This class of common proteins plays an essential role in the biogenesis of the snRNPs. The genes encoding human Sm G map to chromosomes 2. In addition, these proteins represent the major targets for the so-called anti-Sm auto-antibodies which are diagnostic for systemic lupus erythematosus (SLE). One class of these autoantibodies reacts specifically with native Sm E-F-G complexes. Recombinant human SNRPG protein, fused to His-tag at N-terminus, was expressed in E.coli and purified by using conventional chromatography techniques.