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| {{STRUCTURE_2bpm| PDB=2bpm | SCENE= }} | | {{STRUCTURE_2bpm| PDB=2bpm | SCENE= }} |
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| '''STRUCTURE OF CDK2-CYCLIN A WITH PHA-630529'''
| | ===STRUCTURE OF CDK2-CYCLIN A WITH PHA-630529=== |
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| ==Overview==
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| Inhibitors of cyclin-dependent kinases (CDK) such as CDK2/cyclin A-E are currently undergoing clinical trials to verify their potential as new anticancer agents. In a previous article we described the lead discovery process of a 3-aminopyrazole class of CDK2/cyclin A-E inhibitors. The endpoint of this process was PNU-292137, a compound endowed with in vivo antitumor activity in a mouse tumor xenograft model. We optimized this lead compound to improve some physicochemical properties, notably solubility and plasma protein binding. This lead optimization process brought us to the discovery of (2S)-N-(5-cyclopropyl-1H-pyrazol-3-yl)-2-[4-(2-oxo-1-pyrrolidinyl)phenyl]p ropanamide (PHA-533533, 13), a compound with a balanced activity vs druglike profile. Compound 13 inhibited CDK2/cyclin A with a K(i) of 31 nM, counteracting tumor cell proliferation of different cell lines with an IC(50) in the submicromolar range. Solubility was improved more than 10 times over the starting lead, while plasma protein binding was decreased from 99% to 74%. With exploitation of this globally enhanced in vitro profile, 13 was more active than PNU-292137 in vivo in the A2780 xenograft model showing a tumor growth inhibition of 70%. Proof of mechanism of action was obtained in vivo by immunohistochemical analysis of tumor slices of 13-treated vs untreated animals.
| | The line below this paragraph, {{ABSTRACT_PUBMED_15828833}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 15828833 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_15828833}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Serine/threonine-protein kinase]] | | [[Category: Serine/threonine-protein kinase]] |
| [[Category: Transferase]] | | [[Category: Transferase]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 20:37:01 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 04:50:35 2008'' |
