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Peptide Bonds02:43

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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Genotypic Inference of HIV-1 Tropism Using Population-based Sequencing of V3
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Genotypic Inference of HIV-1 Tropism Using Population-based Sequencing of V3

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HIV-1 Integrase-Targeted Short Peptides Derived from a Viral Protein R Sequence.

Xue Zhi Zhao1, Mathieu Métifiot2, Evgeny Kiselev3

  • 1Chemical Biology Laboratory, Center of Cancer Research, Frederick, MD 21702, USA. Xuezhi.Zhao@nih.gov.

Molecules (Basel, Switzerland)
|July 28, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel peptide targeting HIV-1 integrase (IN) through a unique mechanism. This Vpr-derived peptide offers a new strategy for anti-AIDS drug development distinct from current inhibitors.

Keywords:
HIV-1 integraseinhibitorphotoaffinity probeviral protein R

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Area of Science:

  • Virology
  • Drug Discovery
  • Biochemistry

Background:

  • Human Immunodeficiency Virus type 1 (HIV-1) integrase inhibitors (INSTIs) are effective anti-AIDS therapeutics.
  • Current INSTIs function by chelating divalent metal ions, but drug resistance is emerging.
  • Alternative mechanisms to inhibit HIV-1 integrase are needed, especially those targeting interactions within the pre-integration complex (PIC).

Purpose of the Study:

  • To develop and characterize a novel peptide inhibitor of HIV-1 integrase (IN).
  • To investigate the mechanism of action of this Vpr-derived peptide.
  • To explore its potential as a pharmacological tool for identifying new drug targets.

Main Methods:

  • Design and synthesis of a 7-mer peptide based on viral protein R (Vpr) sequence (69-75), incorporating biotin and a photo-reactive group.
  • Assessment of IN inhibitory potency using biochemical assays.
  • Photo-crosslinking experiments to determine direct binding of the peptide to IN.
  • Evaluation of the peptide's effect on IN-DNA interactions and IN multimerization.

Main Results:

  • The Vpr-derived peptide demonstrated low micromolar inhibitory potency against HIV-1 IN.
  • Photo-crosslinking confirmed direct binding of the peptide to IN.
  • The peptide did not impede IN-DNA binding or cause aberrant IN multimerization, distinguishing its mechanism from INSTIs and allosteric inhibitors.

Conclusions:

  • A compact Vpr-derived peptide acts as a novel HIV-1 IN inhibitor.
  • Its distinct mechanism of action, not involving metal ion chelation or allosteric effects, suggests a new pharmacologic site.
  • This peptide serves as a valuable tool for further research into HIV-1 replication and drug development.