Structure-function studies of peptides inhibiting the ribonucleotide reductase activity of herpes simplex virus type I.

Abstract:

:Ac-Tyr298-Ala299-Gly300-Thr301-Val302-I le303-Asn304-Asp305-Leu306-OH (Ac-VZV R2-(298-306)) represents the acetylated form of the C-terminus of varicella-zoster virus (VZV) ribonucleotide reductase subunit 2 (R2). This peptide possesses a high degree of homology with the C-terminus nonapeptide of the herpes simplex virus (HSV) type I and II ribonucleotide reductase R2 protein and is 15 times more potent than the latter in its in vitro inhibition of HSV-1 reductase activity. Accordingly, a new series of analogues based on this structure was studied in vitro. The replacement of Asp305 by Asn, Glu, Gln, Ser, or Cys; of Asn304 by Gln or Ser; of Ile303 and Val302 by D-Val; and of Tyr298 by Cha induced an important loss of inhibitory potency. The substitution of Asn304 by Asp; of Thr301 by Cys, Ser, or Val; of Gly300 by Ala or Val; of Ala299 by Val; or of Tyr298 by homoPhe, 4'-fluoro-Phe, 4'-chloro-Phe, 3'-iodo-Tyr, Me-Tyr, or For-Trp led to a moderate decrease of the Ac-VZV R2-(298-306) potency. The replacement of Val302 by Ile; Ala299 by Cys, Ser, or Thr; or the insertion of a six- or eight-carbon chain between Tyr298 and the NH2 terminus either preserved or slightly increased the inhibitory potency of Ac-VZV R2-(298-306). Finally, the substitution of Tyr298 by Trp or the addition of 4'-nitro-Phe at the amino terminus resulted in a 3-fold increase of potency. Altogether, these results stress the importance of the structural integrity of the minimum active core 302-306 in preserving the inhibitory potency and suggest that further studies on monosubstitutions could be directed at the portion 298-301 of the peptide.

journal_name

J Med Chem

authors

Gaudreau P,Brazeau P,Richer M,Cormier J,Langlois D,Langelier Y

doi

10.1021/jm00080a021

keywords:

subject

Has Abstract

pub_date

1992-01-24 00:00:00

pages

346-50

issue

2

eissn

0022-2623

issn

1520-4804

journal_volume

35

pub_type

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