Sandbox reserved 1752

Publication Abstract from PubMed

A specific DNA complex of the 65-residue, N-terminal fragment of the yeast transcriptional activator, GAL4, has been analysed at 2.7 A resolution by X-ray crystallography. The protein binds as a dimer to a symmetrical 17-base-pair sequence. A small, Zn(2+)-containing domain recognizes a conserved CCG triplet at each end of the site through direct contacts with the major groove. A short coiled-coil dimerization element imposes 2-fold symmetry. A segment of extended polypeptide chain links the metal-binding module to the dimerization element and specifies the length of the site. The relatively open structure of the complex would allow another protein to bind coordinately with GAL4.

: Zinc is responsible for maintaining the secondary structure.

Gal4 has lots of that interact with DNA

The Upstream activation sequence () for Gal 4.It only interacts with one strand of DNA sequence. The UAS is a 881 amino acid protein that binds to DNA, has dimerization, and recruits other transcriptional promoters. This needs galactose in order to be open.

It recognizes a 17 base pair sequence in (5'-CGGRNNRCYNYNCNCCG-3') the upstream activating sequence (UAS-G) of these genes. (This is what I found from sources)

i. I was searching for this, but I kind of struggled to find this when I was looking through the links. ii. The protein interacts with one strand of double stranded DNA.

DNA recognition by GAL4: structure of a protein-DNA complex.,Marmorstein R, Carey M, Ptashne M, Harrison SC Nature. 1992 Apr 2;356(6368):408-14. PMID:1557122^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.