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Peptide-based Identification of Functional Motifs and their Binding Partners
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Peptide-based Identification of Functional Motifs and their Binding Partners

Published on: June 30, 2013

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Identifying and characterising PPE7 (Rv0354c) high activity binding peptides and their role in inhibiting cell

Diana P Díaz1,2, Marisol Ocampo3,4, Yahson Varela1,2

  • 1Fundación Instituto de Inmunología de Colombia (FIDIC), 111321, Bogotá, Colombia.

Molecular and Cellular Biochemistry
|February 17, 2017
PubMed

Insights

Researchers characterized the PPE7 protein from Mycobacterium tuberculosis. A specific peptide (HABP 39224) significantly inhibited bacterial invasion, showing potential for a novel tuberculosis vaccine.

Area of Science:

  • Microbiology
  • Immunology
  • Vaccine Development

Background:

  • The PE/PPE protein family is crucial in Mycobacterium tuberculosis pathogenesis.
  • Understanding the function of specific proteins like PPE7 is essential for developing new tuberculosis (TB) interventions.

Purpose of the Study:

  • To characterize the PPE7 protein and its encoding gene (rv0354c) in Mycobacterium tuberculosis.
  • To investigate the potential of identified high-binding activity peptides (HABPs) in inhibiting M. tuberculosis invasion.

Main Methods:

  • Gene presence and transcription analysis for rv0354c.
  • Subcellular localization of PPE7 protein using immunoelectron microscopy.
  • In vitro testing of HABPs for inhibition of M. tuberculosis H37Rv invasion in epithelial and macrophage cell lines.

Main Results:

  • The rv0354c gene is present and transcribed in the Mycobacterium tuberculosis complex.
  • PPE7 protein was localized to the mycobacterial membrane.
  • HABP 39224 demonstrated >50% inhibition of M. tuberculosis invasion in A549 cells and U937 macrophages.
  • HABP 39225 showed 40% inhibition in U937 cells.

Conclusions:

  • The PPE7 protein is a membrane-associated protein in Mycobacterium tuberculosis.
  • HABP 39224, a conserved peptide from PPE7's C-terminal region, effectively inhibits M. tuberculosis invasion.
  • HABP 39224 represents a promising candidate for developing subunit-based anti-tuberculosis vaccines.
Keywords:
High activity binding peptideMycobacterium tuberculosis H37RvPPE7 proteinSynthetic peptide

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