This project will focus on chondroitin sulfate (CS) glycosaminoglycans, a class of polysaccharides that play important roles in development, viral invasion, cancer, and spinal cord injury. CS polysaccharides display diverse sulfation patterns that are spatiotemporally regulated in vivo. However, efforts to identify functions for specific sulfation motifs have been hampered by the structural complexity of CS and a lack of tools. For instance, well-defined CS molecules cannot be purified from natural sources, and as a consequence, the field has been limited to working with heterogeneously sulfated mixtures of compounds. Genetic deletion of one of the sulfotransferase genes responsible for CS biosynthesis can propagate global changes throughout the carbohydrate chain, making it difficult to pinpoint the role of specific sulfation motifs. In this grant, we will combine the tools of organic chemistry and biology to overcome these challenges. We will exploit synthetic chemistry to assemble defined CS structures (both natural and non-natural) to obtain fundamentally new information about the structure- function relationships of CS. When combined with the power of biochemistry, genetics, cell biology, and neurobiology, these molecules will provide new insights into the physiological roles of carbohydrates in the nervous system and uncover novel mechanisms of neuronal growth and repair. As our project takes a distinctly chemical approach, this work may reveal novel proteins and pathways for therapeutic intervention and aid in the development of new pharmaceuticals to stimulate regeneration after injury, aging or disease.

Public Health Relevance

This research seeks to understand how the structure of chondroitin sulfate glycosaminoglycans regulates fundamental biological processes, such as protein recognition and regulation, cell-cell communication, development, and regeneration after injury. Through the discovery of novel small molecules, proteins and pathways involved in these processes, this work may aid ultimately in the development of new therapeutic approaches to a broad range of disease states, such as cancer, infectious and neurodegenerative diseases.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM093627-03
Application #
8220729
Study Section
Special Emphasis Panel (ZRG1-BCMB-B (02))
Program Officer
Marino, Pamela
Project Start
2010-04-01
Project End
2014-01-31
Budget Start
2012-02-01
Budget End
2013-01-31
Support Year
3
Fiscal Year
2012
Total Cost
$393,283
Indirect Cost
$142,108
Name
California Institute of Technology
Department
Chemistry
Type
Schools of Engineering
DUNS #
009584210
City
Pasadena
State
CA
Country
United States
Zip Code
91125
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Sheng, Gloria J; Oh, Young In; Chang, Shuh-Kuen et al. (2013) Tunable heparan sulfate mimetics for modulating chemokine activity. J Am Chem Soc 135:10898-901
Dick, Gunnar; Tan, Chin Lik; Alves, Joao Nuno et al. (2013) Semaphorin 3A binds to the perineuronal nets via chondroitin sulfate type E motifs in rodent brains. J Biol Chem 288:27384-95
Rogers, Claude J; Hsieh-Wilson, Linda C (2012) Microarray method for the rapid detection of glycosaminoglycan-protein interactions. Methods Mol Biol 808:321-36
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