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New 26S proteasome inhibitors with high selectivity for chymotrypsin-like activity and p53-dependent cytotoxicity

journal contribution
posted on 13.02.2018, 00:00 by Paul Neilsen, AD Pehere, KI Pishas, DF Callen, AD Abell
The 26S proteasome has emerged over the past decade as an attractive therapeutic target in the treatment of cancers. Here, we report new tripeptide aldehydes that are highly specific for the chymotrypsin-like catalytic activity of the proteasome. These new specific proteasome inhibitors demonstrated high potency and specificity for sarcoma cells, with therapeutic windows superior to those observed for benchmark proteasome inhibitors, MG132 and Bortezomib. Constraining the peptide backbone into the β-strand geometry, known to favor binding to a protease, resulted in decreased activity in vitro and reduced anticancer activity. Using these new proteasome inhibitors, we show that the presence of an intact p53 pathway significantly enhances cytotoxic activity, thus suggesting that this tumor suppressor is a critical downstream mediator of cell death following proteasomal inhibition. © 2012 American Chemical Society.

Funding

Other

History

Volume

8

Issue

2

Start Page

353

End Page

359

Number of Pages

7

eISSN

1554-8937

ISSN

1554-8929

Publisher

American Chemical Society

Peer Reviewed

Yes

Open Access

No

Acceptance Date

04/11/2012

External Author Affiliations

University of Adelaide

Era Eligible

Yes

Journal

ACS Chemical Biology

Exports

CQUniversity

Exports