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New Phage Display-Isolated Heptapeptide Recognizing the Regulatory Carboxy-Terminal Domain of Human Tumour Protein p53.

Identifieur interne : 000399 ( Main/Exploration ); précédent : 000398; suivant : 000400

New Phage Display-Isolated Heptapeptide Recognizing the Regulatory Carboxy-Terminal Domain of Human Tumour Protein p53.

Auteurs : Sihem Ben Abid [Tunisie] ; Mouna Sahnoun [Tunisie] ; Ines Yacoubi-Hadj Amor [Tunisie] ; Salma Abdelmoula-Souissi [Tunisie] ; Hajer Hassairi [Tunisie] ; Raja Mokdad-Gargouri [Tunisie] ; Ali Gargouri [Tunisie]

Source :

RBID : pubmed:28710679

Descripteurs français

English descriptors

Abstract

The transcription factor tumor protein p53 (P53) controls a variety of genes most involved in cell cycle and is at the origin of apoptosis when DNA is irreparably damaged. We planned to select novel tumor protein p53-interacting peptides through the screening of hepta-peptide phage-display libraries. For this aim, human tumor suppressor protein p53 was expressed in Escherichia coli as Glutathione S-transferase fusion and purified by affinity chromatography. The phage library was then screened on this immobilized protein target. After three rounds of panning, phages were sequenced and shown to contain a consensus sequence NPNSAQG. Thereafter, either free p53 liberated from the fusion protein through thrombin treatment or Histidine-tagged p53 were recognized efficiently by the selected phage. To locate the p53-binding epitope of the selected hepta-peptide, three long peptides parts of the three known domains of the protein were synthesized and screened by the selected phage/peptide. Thus, the Carboxy-terminal p53 region was shown to be the target of the isolated phage as well as by its derived Fluorescein isothiocyanate-peptide. Molecular docking showed Lysine 386 as an important residue potentially engaged in this interaction. The selected hepta-peptide is a novel p53-interacting peptide, not described by other studies, and could be used as therapeutic tool in the future.

DOI: 10.1007/s10930-017-9730-1
PubMed: 28710679


Affiliations:


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<term>Apoptosis (MeSH)</term>
<term>Biotin (metabolism)</term>
<term>Escherichia coli (genetics)</term>
<term>Fluorescein-5-isothiocyanate (metabolism)</term>
<term>Glutathione Transferase (genetics)</term>
<term>Humans (MeSH)</term>
<term>Molecular Docking Simulation (MeSH)</term>
<term>Peptide Library (MeSH)</term>
<term>Peptides (chemistry)</term>
<term>Peptides (genetics)</term>
<term>Peptides (metabolism)</term>
<term>Recombinant Fusion Proteins (chemistry)</term>
<term>Recombinant Fusion Proteins (genetics)</term>
<term>Recombinant Fusion Proteins (metabolism)</term>
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<term>Tumor Suppressor Protein p53 (genetics)</term>
<term>Tumor Suppressor Protein p53 (metabolism)</term>
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<term>Banque de peptides (MeSH)</term>
<term>Biotine (métabolisme)</term>
<term>Escherichia coli (génétique)</term>
<term>Fluorescéine-5-isothiocyanate (métabolisme)</term>
<term>Glutathione transferase (génétique)</term>
<term>Humains (MeSH)</term>
<term>Peptides (composition chimique)</term>
<term>Peptides (génétique)</term>
<term>Peptides (métabolisme)</term>
<term>Protéine p53 suppresseur de tumeur (composition chimique)</term>
<term>Protéine p53 suppresseur de tumeur (génétique)</term>
<term>Protéine p53 suppresseur de tumeur (métabolisme)</term>
<term>Protéines de fusion recombinantes (composition chimique)</term>
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<term>Protéines de fusion recombinantes (métabolisme)</term>
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<term>Fluorescein-5-isothiocyanate</term>
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<div type="abstract" xml:lang="en">The transcription factor tumor protein p53 (P53) controls a variety of genes most involved in cell cycle and is at the origin of apoptosis when DNA is irreparably damaged. We planned to select novel tumor protein p53-interacting peptides through the screening of hepta-peptide phage-display libraries. For this aim, human tumor suppressor protein p53 was expressed in Escherichia coli as Glutathione S-transferase fusion and purified by affinity chromatography. The phage library was then screened on this immobilized protein target. After three rounds of panning, phages were sequenced and shown to contain a consensus sequence NPNSAQG. Thereafter, either free p53 liberated from the fusion protein through thrombin treatment or Histidine-tagged p53 were recognized efficiently by the selected phage. To locate the p53-binding epitope of the selected hepta-peptide, three long peptides parts of the three known domains of the protein were synthesized and screened by the selected phage/peptide. Thus, the Carboxy-terminal p53 region was shown to be the target of the isolated phage as well as by its derived Fluorescein isothiocyanate-peptide. Molecular docking showed Lysine 386 as an important residue potentially engaged in this interaction. The selected hepta-peptide is a novel p53-interacting peptide, not described by other studies, and could be used as therapeutic tool in the future.</div>
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