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The energy landscape of a selective tumor-homing pentapeptide

  1. Author:
    Zanuy, D.
    Flores-Ortega, A.
    Casanovas, J.
    Curco, D.
    Nussinov, R.
    Aleman, C.

  2. Author Address

    Zanuy, David, Flores-Ortega, Alejandra, Aleman, Carlos] Univ Politecn Cataluna, Dept Engn Quim, ETS Engn Ind Barcelona, E-08028 Barcelona, Spain. [Casanovas, Jordi] Univ Lleida, Dept Quim, Escola Politecn Super, E-25001 Lleida, Spain. [Curco, David] Univ Barcelona, Dept Engn Quim, Fac Quim, E-08028 Barcelona, Spain. [Nussinov, Ruth] NCI, Basic Res Program, SAIC Frederick Inc, Ctr Canc Res ,Nanobiol Program, Frederick, MD 21702 USA. [Nussinov, Ruth] Tel Aviv Univ, Dept Human Genet, Sackler Sch Med, IL-69978 Tel Aviv, Israel.
    1. Year: 2008
  2. Journal: Journal of Physical Chemistry B
    1. 112
    2. 29
    3. Pages: 8692-8700
  4. Type of Article: Article
  1. Abstract:

    Recently, a potentially powerful strategy based on phage-display libraries has been presented to target tumors via homing peptides attached to nanoparticles. The Cys-Arg-Glu-Lys-Ala (CREKA) peptide sequence has been identified as a tumor-homing peptide that binds to clotted plasmas proteins present in tumor vessels and interstitium. The aim of this work consists of mapping the conformational profile of CREKA to identify the bioactive conformation. For this purpose, a conformational search procedure based on modified simulated annealing combined with molecular dynamics was applied to three systems that mimic the experimentally used conditions: (i) the free peptide, (ii) the peptide attached to a nanoparticle, and (iii) the peptide inserted in a phage display protein. In addition, the free peptide was simulated in an ionized aqueous solution environment, which mimics the ionic strength of the physiological medium. Accessible minima of all simulated systems reveal a multiple interaction pattern involving the ionized side chains of Arg, Glu, and Lys, which induces a P-turn motif in the backbone observed in all simulated CREKA systems.

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External Sources

  1. PMID: 18588341

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