Abstract:
:A polyphemusin peptide analogue, T22 ([Tyr(5,12), Lys7]-polyphemusin II), and its shortened potent analogues, T134 (des-[Cys(8,13), Tyr(9,12)]-[D-Lys10, Pro11, L-citrulline16]-T22 without C-terminal amide) and T140 [[L-3-(2-naphthyl)alanine3]-T134], strongly inhibit the T-cell line-tropic (T-tropic) HIV-1 infection through their specific binding to a chemokine receptor, CXCR4. T22 is an extremely basic peptide possessing five Arg and three Lys residues in the molecule. In our previous study, we found that there is an apparent correlation in the T22-related peptides between the number of total positive charges and anti-HIV activity or cytotoxicity. Here, we have conducted the conventional Ala-scanning study in order to define the anti-HIV activity pharmacophore of T140 (the strongest analogue among our compounds) and identified four indispensable amino acid residues (Arg2, Nal3, Tyr5, and Arg14). Based on this result, a series of L-citrulline (Cit)-substituted analogues of T140 with decreased net positive charges have been synthesized and evaluated in terms of anti-HIV activity and cytotoxicity. As a result, novel effective inhibitors, TC14003 and TC14005, possessing higher selectivity indexes (SIs, 50% cytotoxic concentration/50% effective concentration) than that of T140 have been developed.
journal_name
Bioorg Med Chem Lettjournal_title
Bioorganic & medicinal chemistry lettersauthors
Tamamura H,Omagari A,Oishi S,Kanamoto T,Yamamoto N,Peiper SC,Nakashima H,Otaka A,Fujii Ndoi
10.1016/s0960-894x(00)00535-7subject
Has Abstractpub_date
2000-12-04 00:00:00pages
2633-7issue
23eissn
0960-894Xissn
1464-3405pii
S0960-894X(00)00535-7journal_volume
10pub_type
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