GSK2801

GSK2801, as an inhibitor of BAZ2A and BAZ2B bromodomains, is potent, selective and cell active acetyl-lysine competitive, with dissociation constants (KD) of 136 and 257 nM for binding to BAZ2B and BAZ2A, respectively [1].

Bromodomains, as protein interaction domains, are acetyl-lysine specific. Bromodomain containing proteins BAZ2A and BAZ2B are closely related. The nucleolar remodeling complex (NoRC) regulates the expression of noncoding RNAs. BAZ2A and BAZ2B constitute the central scaffolding protein of NoRC [1].

In U2OS cells, treatment with the SAHA induced hyperacetylated chromatin. In a GFP-BAZ2A fusion construct, the conserved asparagines that are essential for recognizing the acetylated lysine has been mutated. When a GFP-BAZ2A fusion construct was transfected into SAHA-treated U2OS cells, the mutant construct accelerated FRAP half-recovery time. Treatment with GSK2801 alone in U2OS cells also accelerated FRAP half-recovery time. Both acceleration extents are the same. This meant that GSK2801 can displace BAZ2A from chromatin [1].

Pharmacokinetic parameters of GSK2801 after intraperitoneal and oral dosing to male CD1 mice were measured. Data showed that after oral dosing in vivo, GSK2801 has reasonable exposure, reasonable plasma stability and modest clearance. GSK2801 can be used as an inhibitor of BAZ2A/B bromodomain in vivo [1]. No more in vivo data of the treatment with GSK2801 are found.

Reference:
[1].  Chen P, Chaikuad A, Bamborough P, et al. Discovery and Characterization of GSK2801, a Selective Chemical Probe for the Bromodomains BAZ2A and BAZ2B. Journal of medicinal chemistry, 2015.

Discovery and Characterization of GSK2801, a Selective Chemical Probe for the Bromodomains BAZ2A and BAZ2B.[Pubmed:25799074]

J Med Chem. 2016 Feb 25;59(4):1410-24.

Bromodomains are acetyl-lysine specific protein interaction domains that have recently emerged as a new target class for the development of inhibitors that modulate gene transcription. The two closely related bromodomain containing proteins BAZ2A and BAZ2B constitute the central scaffolding protein of the nucleolar remodeling complex (NoRC) that regulates the expression of noncoding RNAs. However, BAZ2 bromodomains have low predicted druggability and so far no selective inhibitors have been published. Here we report the development of GSK2801, a potent, selective and cell active acetyl-lysine competitive inhibitor of BAZ2A and BAZ2B bromodomains as well as the inactive control compound GSK8573. GSK2801 binds to BAZ2 bromodomains with dissociation constants (KD) of 136 and 257 nM for BAZ2B and BAZ2A, respectively. Crystal structures demonstrated a canonical acetyl-lysine competitive binding mode. Cellular activity was demonstrated using fluorescent recovery after photobleaching (FRAP) monitoring displacement of GFP-BAZ2A from acetylated chromatin. A pharmacokinetic study in mice showed that GSK2801 had reasonable in vivo exposure after oral dosing, with modest clearance and reasonable plasma stability. Thus, GSK2801 represents a versatile tool compound for cellular and in vivo studies to understand the role of BAZ2 bromodomains in chromatin biology.

GSK2801 is a potent, selective, orally active and cell active acetyl-lysine competitive BAZ2A and BAZ2B bromodomains inhibitor with Kd values of 136 nM and 257 nM, respectively. GSK2801 shows >50-fold selectivity for BAZ2A/B over BRD4.

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