Sp1 Background Information Sp1 is a sequence-specific transcription factor that recognizes GGGGCGGGGC and closely related sequences, which are often referred to as GC boxes. Sp1 was initially identified as a HeLa cell-derived factor that selectively activates in vitro transcription from the SV40 promoter and binds to the multiple GC boxes in the 21-bp repeated elements in SV40. The sequence specificity of DNA binding is conferred by Zn (II) fingers, whereas a different region of Sp1 appears to regulate the affinity of DNA binding. Sp1 belongs to a subgroup of transcription factors that are phosphorylated upon binding to promoter sequences. Evidence suggests that the early growth response gene, Erg-1 (also known as Zif268 or NGF1-A) (7), may downregulate certain mammalian gene promoters by competing with Sp1 for binding to an overlapping binding motif. The gene encoding human Sp1 maps to chromosome 12q13.1.
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Sp1 (E-3)
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Sp1 (E-3): sc-17824. Western blot analysis of Sp1 expression in K-562 nuclear extract.
Sp1 (E-3): sc-17824. ChIP analysis of Sp1 recruitment to genomic amplicons. Four (1-4) different human genomic Sp-1 and two control amplicons (5,6) were analyzed by quantitative PCR (primer sequences available in on-line supplemental data). Data generated in collaboration with Drs. N. Trinklein and R. Myers, Stanford University (ENCODE Project).
