Biselectivity of isoDGR peptides for fibronectin binding integrin subtypes α5β1 and αvβ6: conformational control through flanking amino acids.
Integrins are the major class of cell adhesion proteins. Their interaction with different ligands of the extracellular matrix is diverse. To get more insight into these interactions, artificial ligands endowed with a well-defined activity/selectivity profile are necessary. Herein, we present a library of cyclic pentapeptides, based on our previously reported peptide motif c(-phg-isoDGR-X-), in which high activity toward fibronectin binding integrins α5β1 and αvβ6 and not on vitronectin binding integrins αvβ3 and αvβ5 has been achieved by changing the flanking amino acids. The structure of the most promising candidates has been determined using a combined approach of NMR, distance geometry, and molecular dynamics simulations, and docking studies have been further used to elucidate the peptide-integrin interactions at the molecular level. The peptides' binding affinity has been characterized by enzyme linked immunosorbent assay experiments, and the results have been verified by cell adhesion experiments on specifically functionalized surfaces.
Institute for Advanced Study and Center of Integrated Protein Science, Department Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany.
Alexander
A
Bochen
Udaya Kiran
UK
Marelli
Elke
E
Otto
Diego
D
Pallarola
Carlos
C
Mas-Moruno
Francesco Saverio
FS
Di Leva
Heike
H
Boehm
Joachim P
JP
Spatz
Ettore
E
Novellino
Horst
H
Kessler
Luciana
L
Marinelli
D000596:Amino Acids / Q000737:chemistry*; D000818:Animals; D000951:Antigens, Neoplasm / Q000378:metabolism*; D002448:Cell Adhesion / Q000187:drug effects; D002460:Cell Line; D005340:Fibrinogen / Q000378:metabolism; D005353:Fibronectins / Q000378:metabolism*; D006046:Gold / Q000737:chemistry; D039081:Integrin alpha5beta1 / Q000378:metabolism*; D016023:Integrins / Q000378:metabolism*; D053779:Latent TGF-beta Binding Proteins / Q000378:metabolism; D008968:Molecular Conformation; D062105:Molecular Docking Simulation; D056004:Molecular Dynamics Simulation; D053758:Nanoparticles; D009842:Oligopeptides / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D010456:Peptides, Cyclic / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D011485:Protein Binding; D051381:Rats; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D019096:Vitronectin / Q000378:metabolism
D000596:Amino Acids; D000951:Antigens, Neoplasm; D005353:Fibronectins; D039081:Integrin alpha5beta1; D016023:Integrins; D053779:Latent TGF-beta Binding Proteins; D009842:Oligopeptides; D010456:Peptides, Cyclic; D019096:Vitronectin; C073878:integrin alphavbeta6; D006046:Gold; D005340:Fibrinogen