4FLP image
Entry Detail
PDB ID:
4FLP
Title:
Crystal Structure of the first bromodomain of human BRDT in complex with the inhibitor JQ1
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-06-15
Release Date:
2012-07-11
Method Details:
Experimental Method:
Resolution:
2.23 Å
R-Value Free:
0.25
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 21 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Bromodomain testis-specific protein
Chain IDs:A, B
Chain Length:119
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Small-Molecule Inhibition of BRDT for Male Contraception.
Cell(Cambridge,Mass.) 150 673 684 (2012)
PMID: 22901802 DOI: 10.1016/j.cell.2012.06.045

Abstact

A pharmacologic approach to male contraception remains a longstanding challenge in medicine. Toward this objective, we explored the spermatogenic effects of a selective small-molecule inhibitor (JQ1) of the bromodomain and extraterminal (BET) subfamily of epigenetic reader proteins. Here, we report potent inhibition of the testis-specific member BRDT, which is essential for chromatin remodeling during spermatogenesis. Biochemical and crystallographic studies confirm that occupancy of the BRDT acetyl-lysine binding pocket by JQ1 prevents recognition of acetylated histone H4. Treatment of mice with JQ1 reduced seminiferous tubule area, testis size, and spermatozoa number and motility without affecting hormone levels. Although JQ1-treated males mate normally, inhibitory effects of JQ1 evident at the spermatocyte and round spermatid stages cause a complete and reversible contraceptive effect. These data establish a new contraceptive that can cross the blood:testis boundary and inhibit bromodomain activity during spermatogenesis, providing a lead compound targeting the male germ cell for contraception.

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