Our long-range goal is the development of artificial salivas for the treatment of salivary dysfunction. This Program Project Grant (PPG) will study a potentially important ingredient of artificial salivas, namely mucins. The research objectives of the PPG are two-fold. The first is to understand on a molecular level the structure-function relationships of human salivary mucins (higher molecular weight MG1 and lower molecular weight MG2) and how these molecules are made in situ. The second is to enhance these mechanisms through selective endogenous or exogenous molecular manipulation of the host. These goals are being pursued in three integrated projects: (A) Conformation/Bioactivity of Human Salivary Mucin Glycans (Dr. Michael J. Levine, Director); (B) Structure/Regulation of Human Salivary Apo-Mucin Genes (Dr. Libuse A. Bobek, Director); and (C) Regulation of Human Salivary Mucin Glycosylation (DR. Joseph T. Y Lau, Director). Project A will use a biochemical/biophysical approach to synthesize MG2 glycopeptides with varying levels of O-linked units. The bioactivity of these glycopeptides will be compared to native MG2 to assess the role of glycosylation patterns on biological function. In subsequent studies, the data obtained will be used to design mucin peptides (e.g. glycomimetics) that mimic the conformation and biological properties of bioactive glycopeptides. Project B will use a molecular biology approach to study MG2 (MUC7) gene expression and characterize the protein structure of the apo-MG1 monomeric biology approach to examine the molecular and cellular factors that dictate glycan composition in human salivary mucins. Studies will focus on the biosynthesis of the sialylated- and fucosylated-Core 1 oligosaccharides on MG2. Knowledge obtained in all 3 projects could eventually provide a template for the design of bioactive glycomimetics and recombinant mucin analogs for use in artificial salivas and gene therapy protocols for augmenting mucin expression.

Agency
National Institute of Health (NIH)
Institute
National Institute of Dental & Craniofacial Research (NIDCR)
Type
Research Program Projects (P01)
Project #
5P01DE007585-10
Application #
2749309
Study Section
Special Emphasis Panel (ZDE1-YS (07))
Project Start
1988-05-01
Project End
2000-05-31
Budget Start
1998-08-01
Budget End
2000-05-31
Support Year
10
Fiscal Year
1998
Total Cost
Indirect Cost
Name
State University of New York at Buffalo
Department
Dentistry
Type
Schools of Dentistry
DUNS #
038633251
City
Buffalo
State
NY
Country
United States
Zip Code
14260
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Narasimhamurthy, S; Naganagowda, G A; Janagani, S et al. (2000) Solution structure of O-glycosylated C-terminal leucine zipper domain of human salivary mucin (MUC7). J Biomol Struct Dyn 18:145-54
Tseng, C C; Tseng, C P; Levine, M J et al. (2000) Differential effect toward inhibition of papain and cathepsin C by recombinant human salivary cystatin SN and its variants produced by a baculovirus system. Arch Biochem Biophys 380:133-40
Satyanarayana, J; Situ, H; Narasimhamurthy, S et al. (2000) Divergent solid-phase synthesis and candidacidal activity of MUC7 D1, a 51-residue histidine-rich N-terminal domain of human salivary mucin MUC7. J Pept Res 56:275-82
Gururaja, T L; Levine, J H; Tran, D T et al. (1999) Candidacidal activity prompted by N-terminus histatin-like domain of human salivary mucin (MUC7)1. Biochim Biophys Acta 1431:107-19
Naganagowda, G A; Gururaja, T L; Satyanarayana, J et al. (1999) NMR analysis of human salivary mucin (MUC7) derived O-linked model glycopeptides: comparison of structural features and carbohydrate-peptide interactions. J Pept Res 54:290-310
Khan, S H; Aguirre, A; Bobek, L A (1998) In-situ hybridization localized MUC7 mucin gene expression to the mucous acinar cells of human and MUC7-transgenic mouse salivary glands. Glycoconj J 15:1125-32
Satyanarayana, J; Gururaja, T L; Naganagowda, G A et al. (1998) A concise methodology for the stereoselective synthesis of O-glycosylated amino acid building blocks: complete 1H NMR assignments and their application in solid-phase glycopeptide synthesis. J Pept Res 52:165-79
Gururaja, T L; Ramasubbu, N; Venugopalan, P et al. (1998) Structural features of the human salivary mucin, MUC7. Glycoconj J 15:457-67
Naganagowda, G A; Gururaja, T L; Levine, M J (1998) Delineation of conformational preferences in human salivary statherin by 1H, 31P NMR and CD studies: sequential assignment and structure-function correlations. J Biomol Struct Dyn 16:91-107

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