The world's first wiki where authorship really matters (Nature Genetics, 2008). Due credit and reputation for authors. Imagine a global collaborative knowledge base for original thoughts. Search thousands of articles and collaborate with scientists around the globe.

wikigene or wiki gene protein drug chemical gene disease author authorship tracking collaborative publishing evolutionary knowledge reputation system wiki2.0 global collaboration genes proteins drugs chemicals diseases compound
Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Boronic acids as inhibitors of steroid sulfatase.

Steroid sulfatase ( STS) catalyzes the hydrolysis of steroidal sulfates such as estrone sulfate (ES1) to the corresponding steroids and inorganic sulfate. STS is considered to be a potential target for the development of therapeutics for the treatment of steroid-dependent cancers. Two steroidal and two coumarin- and chromenone-based boronic acids were synthesized and examined as inhibitors of purified STS. The boronic acid analog of estrone sulfate bearing a boronic acid moiety at the 3-position in place of the sulfate group was a good competitive STS inhibitor with a K(i) of 2.8muM at pH 7.0 and 6.8muM at pH 8. 8. The inhibition was reversible and kinetic properties corresponding to the mechanism for slow-binding inhibitors were not observed. An estradiol derivative bearing a boronic acid group at the 3-position and a benzyl group at the 17-position was a potent reversible, non-competitive STS inhibitor with a K(i) of 250nM. However, its 3-OH analog, a known STS inhibitor, exhibited an almost identical affinity for STS and also bound in a non-competitive manner. It is suggested that these compounds prefer to bind in a hydrophobic tunnel close to the entrance to the active site. The coumarin and chromenone boronic acids were modest inhibitors of STS with IC(50)s of 86 and 171muM, respectively. Surprisingly, replacing the boronic acid group of the chromenone derivative with an OH group yielded a good reversible, mixed type inhibitor with a K(i) of 4.6muM. Overall, these results suggest that the boronic acid moiety must be attached to a platform very closely resembling a natural substrate in order for it to impart a beneficial effect on binding affinity compared to its phenolic analog.[1]

References

  1. Boronic acids as inhibitors of steroid sulfatase. Ahmed, V., Liu, Y., Silvestro, C., Taylor, S.D. Bioorg. Med. Chem. (2006) [Pubmed]
 
WikiGenes - Universities