Description_x000D_ General description_x000D_ Sp1 protein was the first transcription factor to be cloned and characterized. It was first detected in HeLa cells on the basis of its ability to activate the SV40 early promoter transcription. Analysis of structure and function has revealed that Sp1 can be separated into discrete functional domains. The DNA-binding domain consists of three zinc fingers that specifically bind to the GC-box element._x000D_ Immunogen_x000D_ SP1 (NP_612482, 522 a.a. ~ 618 a.a) full length recombinant protein with GST tag. MW of the GST tag alone is 26 KDa._x000D_ Sequence_x000D_ QLSSMPGLQTINLSALGTSGIQVHPIQGLPLAIANAPGDHGAQLGLHGAGGDGIHDDTAGGEEGENSPDAQPQAGRRTRREACTCPYCKDSEGRGSG*_x000D_ Physical form_x000D_ Solution in phosphate buffered saline, pH 7.4_x000D_ Biochem/physiol Actions_x000D_ Sp1 protein was shown to recognize and bind selectively to a GC-rich consensus sequence (GC-box: GGGCGG or CACCC) that presents in the promoter of several important cellular genes, including Simian vacuolating virus 40 (SV40) early, human immunodeficiency virus-1 (HIV-1), platelet-derived growth factor subunit B (PDGF-B), Myc, c-Src etc. In addition to transcription, Sp1 function has been linked to cell growth, cancer and Huntington disease.