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pubmed-article:14695821pubmed:abstractTextA series of novel alpha-ketoamides incorporating stereoisomeric residues with different electronic properties at the P(1)'-position were synthesized to study the electronic requirements for inhibitor binding to the S(1)'-subsite of calpain I. The results of the study suggested the presence of an acidic amino acid residue at the S(1)'-subsite of calpain I. For example, ester 1a (Cbz-l-Leu-l-Phe-CO-d-Phe-OMe) was over 450-fold more potent than its carboxylic acid derivative 2a (Cbz-l-Leu-l-Phe-CO-d-Phe-OH). Additionally, amidino derivative 3a (Cbz-l-Leu-l-Phe-CONH-d-CH[C(NH)NH(2)]Bn) was about 6000-fold more potent than 2a. Furthermore, 4a (Cbz-l-Leu-l-Phe-CONHCH(2)Bn) was 12-fold less potent than its aza analogue 4b (Cbz-l-Leu-l-Phe-CONHNHBn). The results are consistent with the presence of an acidic amino acid residue at the S(1)'-subsite of calpain I. The acidic amino acid residue was found to be Glu261 via molecular modeling studies.lld:pubmed
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pubmed-article:14695821pubmed:authorpubmed-author:ZhengXiaozhan...lld:pubmed
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pubmed-article:14695821pubmed:pagination72-9lld:pubmed
pubmed-article:14695821pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:14695821pubmed:articleTitleDesign, synthesis, molecular modeling studies, and calpain inhibitory activity of novel alpha-ketoamides incorporating polar residues at the P1'-position.lld:pubmed
pubmed-article:14695821pubmed:affiliationDepartment of Pharmaceutical Sciences, University of Tennessee Health Science Center, Memphis, Tennessee 38163, USA. idonkor@utmem.edulld:pubmed
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pubmed-article:14695821pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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