Russian Journal of Bioorganic Chemistry

, Volume 44, Issue 2, pp 158–164 | Cite as

Effect of Low Charge and High Hydrophobicity on Antimicrobial Activity of the Quinazolinone-Peptide Conjugates

  • Kadallipura Puttaswamy Rakesh
  • Suhas Ramesh
  • Shivakumar
  • Dase Channe Gowda
Article
  • 7 Downloads

Abstract

Peptides of relatively low charge and a high number of hydrophobic amino acids were designed. The amino acid sequence of designed peptides was GXGVP, where X equaled to W, Y, F, D, and T with a combination of hydrophobic, charged and polar units. These peptides were linked to quinazolinones to obtain a new class of compounds with synergistic features. The hybrids displayed antimicrobial activity against Gram-positive and Gram-negative bacteria. In particular, Trp, Tyr, and Phe-containing peptides showed greater antimicrobial potency than the reference standards. Alkyl chain length variations in heterocyclic moiety indicated that hybrids with propyl group were more active than butyl derivatives. Improved results were observed for debenzylated versions of the conjugates compared to their benzylated counterparts. Implementation of the hybrid structures of varying charge, hydrophobicity, and alkyl chain length would be a promising approach to obtaining effective antimicrobial agents.

Keywords

pentapeptides quinazolinones hydrophobic antimicrobial conjugation 

Abbreviations

QZN (I)

3-(4-oxo-3,4-dihydroquinazolin-2-yl)propanoic acid

QZN (II)

4-(4-oxo-3,4-dihydroquinazolin-2-yl)butanoic acid

EDCI

1-(3-dimethylaminopropyl)-3-ethyl-carbodiimide

HOBt

N-hydroxybenzotriazole

NMM

N-methylmorpholine

Boc

tert-butyloxycarbonyl

TFA

trifluoroacetic acid

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • Kadallipura Puttaswamy Rakesh
    • 1
  • Suhas Ramesh
    • 2
  • Shivakumar
    • 1
  • Dase Channe Gowda
    • 1
  1. 1.Department of Studies in ChemistryUniversity of MysoreManasagangotri, MysuruIndia
  2. 2.Postgraduate Department of ChemistryJSS College of Arts, Commerce, and Science, B N RoadMysuruIndia

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