What binds to GC box?
By Daniel Moore
What binds to GC box?
In molecular biology, a GC box, also known as a GSG box, is a distinct pattern of nucleotides found in the promoter region of some eukaryotic genes. Some known GC box-binding proteins include Sp1, Krox/Egr, Wilms’ tumor, MIGI, and CREA. The GC box is commonly the binding site for Zinc finger proteins.
What does the GC box do?
Assembly of the transcriptional machinery is enhanced by the binding of the protein Sp1, a transcription factor, to a GC box. Sp1 is expressed in all eukaryotic cells, so having a GC box present in a transcriptional regulatory region increases the amount of transcription for that gene.
Is GC box conserved?
The GJB2 gene consists of two exons, with exon 2 encoding the 208 amino acid protein. Exon 1 is not translated. The promoter region of the mouse and human genes is highly conserved, and includes GC boxes, GT boxes, and a TTAAAA box (Kiang, D. T. et al., 1997).
Is Tfiib a protein?
Structure. TFIIB is a single 33kDa polypeptide consisting of 316 amino acids. TFIIB makes sequence-specific protein-DNA interactions with the B recognition element (BRE), a promoter element flanking the TATA element.
Is the GC box a core promoter?
A GC box is a cis-acting transcriptional regulatory element (see Transcription Factors, Eukaryotic promoters) that contains the sequence 5′-GGGCGG-3′ at its core and is bound by the transcription factor Sp1.
Is CAAT box a promoter?
The CAAT box is what is known as a core promoter, also known as the basal promoter or simply the promoter, is a region of DNA that initiates transcription of a particular gene.
What does TFIIB bind?
TFIIB carries out at least two functions: it interacts directly with the TATA-binding protein (TBP) and helps to recruit RNA polymerase II into the initiation complex. The sequence of TFIIB reveals a potential zinc-binding domain and an imperfect duplication of approximately 70 amino acids.
Does TFIIB bind to DNA?
TFIIB requires at least seven base pairs of DNA on either side of the TATA box to form a stable TFIIB-TBP-DNA complex. This analysis suggests that TFIIB binds beneath the concave surface of TBP, contacting DNA both upstream and downstream of the TATA box.
Where is CAAT box located?
A semi-conserved “box” of DNA with the “consensus” sequence GGCCAATCT, located 75–80 nucleotides upstream—i.e., in the 5′ direction from the start site for transcription of alpha and beta globin genes—forming part of the promoter site for RNA polymerase II.
What is the difference between TATA box and CAAT box?
The key difference between TATA and CAAT box is that TATA box is a conserved nucleotide region which has a consensus sequence of TATAWAW while CAAT box is a conserved nucleotide region with a consensus sequence of GGCCAATCT. They are non-coding DNA sequences found upstream to the transcription initiation site.
