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SRP2123

Sigma-Aldrich

Sp1 (GC-box binding protein), GST tagged human

recombinant, expressed in E. coli, ≥70% (SDS-PAGE)

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NACRES:
NA.26

biological source

human

recombinant

expressed in E. coli

Assay

≥70% (SDS-PAGE)

form

frozen liquid

mol wt

~62.8 kDa

packaging

pkg of 10 μg

storage condition

avoid repeated freeze/thaw cycles

concentration

300 μg/mL

color

clear colorless

NCBI accession no.

NM_138473

UniProt accession no.

P08047

shipped in

dry ice

storage temp.

−70°C

Gene Information

human ... SP1(6667)

General description

Sp1 is a sequence-specific DNA-binding protein and a eukaryotic transcription factor. It is a ubiquitously expressed nuclear protein. It is one of the first transcription factors to be identified, and the first whose gene was cloned. It was identified as a host factor in HeLa cells, which interacted with the GC-rich sites in SV40 (Simian virus 40) early promoter, and was crucial for in vitro transcription of this promoter. Sp1 is a single polypeptide chain composed of 778 amino acids, and has a molecular weight of 105kDa.

Biochem/physiol Actions

Sp1 binds to GC-rich sequences in a wide variety of promoters. It interacts with cell type or stage-specific transcription factors, and thus, regulates transcription of specific genes. It also controls the formation of the transcription initiation complex. This protein plays a key role in controlling the basal levels of glutathione S-transferase (GSTP1) promoter and the expression of leukotriene C4 synthase gene in the THP-1, a monocyte-like cell line.
Sp1 was first detected in HeLa cells on the basis of its ability to activate the SV40 early promoter transcription. Subsequently it 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 SV40 early, HIV-1, PDGF-B etc. Sp1 was the first transcription factor to be cloned and. 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. Sp1 contains at least four separate transcriptional activation domains. Two of these domains are glutamine-rich, a well-characterized motif found in several other transcription factors. In addition to transcription, Sp1 function has been linked to cell growth, cancer, Huntington disease and other disorders through transcriptional regulation or specific protein-protein interactions. The function of Sp1 can be regulated by phosphorylation and glycosylation.

Physical form

Clear and colorless frozen liquid solution

Preparation Note

Use a manual defrost freezer and avoid repeated freeze-thaw cycles. While working, please keep sample on ice.

Storage Class Code

10 - Combustible liquids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Regulatory Information

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New insights into the multiple functions of Spl, a ubiquitous transcription factor.
Parnaik VK
Current Science, 76(2) , 166-172 (1999)
Sp1 and Sp3 function as key regulators of leukotriene C(4) synthase gene expression in the monocyte-like cell line, THP-1.
Serio KJ et al
American Journal of Respiratory Cell and Molecular Biology, 23(2), 234-240 (2000)
Sp1-mediated transcriptional activation of the human Pi class glutathione S-transferase promoter.
Moffat GJ et al
The Journal of Biological Chemistry, 271(2), 1054-1060 (1996)
W S Dynan et al.
Cell, 35(1), 79-87 (1983-11-01)
Fractionation of HeLa cell extracts reveals the presence of a promoter-specific transcription factor, Sp 1, which activates a class of promoters that includes the SV40 early promoter but not several others that have been tested. We analyzed SV40 early-promoter deletion
J T Kadonaga et al.
Cell, 51(6), 1079-1090 (1987-12-24)
Transcription factor Sp1 is a protein present in mammalian cells that binds to GC box promoter elements and selectively activates mRNA synthesis from genes that contain functional recognition sites. We have isolated a cDNA that encodes the 696 C-terminal amino
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