Summary information and primary citation

PDB-id
4rkh; SNAP-derived features in text and JSON formats; DNAproDB
Class
DNA binding protein-DNA
Method
X-ray (2.0 Å)
Summary
Structure of the msl2 cxc domain bound with a specific mre sequence
Reference
Zheng S, Villa R, Wang J, Feng Y, Wang J, Becker PB, Ye K (2014): "Structural basis of X chromosome DNA recognition by the MSL2 CXC domain during Drosophila dosage compensation." Genes Dev., 28, 2652-2662. doi: 10.1101/gad.250936.114.
Abstract
The male-specific lethal dosage compensation complex (MSL-DCC) selectively assembles on the X chromosome in Drosophila males and activates gene transcription by twofold through histone acetylation. An MSL recognition element (MRE) sequence motif nucleates the initial MSL association, but how it is recognized remains unknown. Here, we identified the CXC domain of MSL2 specifically recognizing the MRE motif and determined its crystal structure bound to specific and nonspecific DNAs. The CXC domain primarily contacts one strand of DNA duplex and employs a single arginine to directly read out dinucleotide sequences from the minor groove. The arginine is flexible when bound to nonspecific sequences. The core region of the MRE motif harbors two binding sites on opposite strands that can cooperatively recruit a CXC dimer. Specific DNA-binding mutants of MSL2 are impaired in MRE binding and X chromosome localization in vivo. Our results reveal multiple dynamic DNA-binding modes of the CXC domain that target the MSL-DCC to X chromosomes.

Cartoon-block schematics in six views (download the tarball)

PyMOL session file Download PDB file View in 3Dmol.js