Cell adhesion plays a critical role in the development of many diseases, including arthritis, metastatic cancer and diseases caused by the invasion of cells by viruses and bacteria. Cell adhesion is mediated by interactions between receptors on the cell surface and ligands of the extracellular matrix or other surfaces. Receptor molecules include the glycosaminoglycan part of proteoglycans such as heparan sulfate proteoglycan and ligands include cell adhesion proteins such as fibronectin. The motivation for the proposed research is that interruption of the cell adhesion process with synthetic peptides and/or oligosaccharides has potential as a therapeutic intervention (anti-adhesion therapy) in the development of diseases in which cell adhesion plays a critical role. For example, heparin binding fragments of cell adhesion proteins can inhibit the experimental metastasis of several metastatic tumors and heparin can inhibit the replication of human immunodeficiency virus type- 1 (HIV-1). The long term objectives are to characterize, in detail at the molecular level, the interactions involved in the binding of peptides by heparin, starting with peptides which have the amino acid sequences of heparin-binding domains of cell adhesion proteins and other proteins. The knowledge to be gained is of clinical interest because it will provide a fundamental basis from which to design new synthetic peptides with even greater selectivity and specificity for use in anti-adhesion therapy and for neutralization of the anticoagulant activity of heparin.
The specific aims of the research are to identify peptide and heparin motifs with a propensity for binding, to determine if binding involves site specific or delocalized electrostatic interactions, to determine the strength of the binding in terms of binding constants, and to characterize structural features of the heparin-peptide complexes. These objectives will be achieved using information obtained from high field nuclear magnetic resonance (NMR) spectroscopy experiments.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
2R01HL056588-04
Application #
6191515
Study Section
Molecular and Cellular Biophysics Study Section (BBCA)
Project Start
1997-05-01
Project End
2004-06-30
Budget Start
2000-07-01
Budget End
2001-06-30
Support Year
4
Fiscal Year
2000
Total Cost
$293,129
Indirect Cost
Name
University of California Riverside
Department
Chemistry
Type
Schools of Earth Sciences/Natur
DUNS #
City
Riverside
State
CA
Country
United States
Zip Code
92521
Wang, Jing; Rabenstein, Dallas L (2009) Interaction of heparin and heparin-derived oligosaccharides with synthetic peptide analogues of the heparin-binding domain of heparin/heparan sulfate-interacting protein. Biochim Biophys Acta 1790:1689-97
Wang, Jing; Rabenstein, Dallas L (2007) Determination of residue-specific acid dissociation constants for peptides by band-selective homonuclear-decoupled (1)H NMR. Anal Chem 79:6799-803
Wang, Jing; Rabenstein, Dallas L (2006) Interaction of heparin with two synthetic peptides that neutralize the anticoagulant activity of heparin. Biochemistry 45:15740-7
Wang, Jing; Borchardt, Dan; Rabenstein, Dallas L (2006) Improved resolution in two-dimensional 1H NMR spectra of peptides by band-selective, homonuclear decoupling during both the evolution and acquisition periods: application to characterization of the binding of peptides by heparin. Magn Reson Chem 44:744-52
Rabenstein, Dallas L (2002) Heparin and heparan sulfate: structure and function. Nat Prod Rep 19:312-31
Chuang, Wei-Lien; McAllister, Heather; Rabenstein, Dallas L (2002) Hexasaccharides from the histamine-modified depolymerization of porcine intestinal mucosal heparin. Carbohydr Res 337:935-45
Chuang, W L; McAllister, H; Rabenstein, L (2001) Chromatographic methods for product-profile analysis and isolation of oligosaccharides produced by heparinase-catalyzed depolymerization of heparin. J Chromatogr A 932:65-74
Chuang, W L; Christ, M D; Rabenstein, D L (2001) Determination of the primary structures of heparin- and heparan sulfate-derived oligosaccharides using band-selective homonuclear-decoupled two-dimensional 1H NMR experiments. Anal Chem 73:2310-6
Chuang, W L; Christ, M D; Peng, J et al. (2000) An NMR and molecular modeling study of the site-specific binding of histamine by heparin, chemically modified heparin, and heparin-derived oligosaccharides. Biochemistry 39:3542-55
Hari, S P; McAllister, H; Chuang, W L et al. (2000) Interaction of heparin with a synthetic pentadecapeptide from the C-terminal heparin-binding domain of fibronectin. Biochemistry 39:3763-73

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