The first section of this proposal will focus on developing a better understanding of somatostatin gene expression. We have demonstrated that only 70 bp of DNA are necessary for correct initiation and tissue specific expression of the rat somatostatin gene. Further deletion of sequences leads to a dramatic fall in level of expression. In addition, Montimini, et al. has reported that sequences within this 60 bp fragment confirm cyclic AMP regulation on the somatostatin gene. Our preliminary results support the idea that several protein factors bind to this 70 bp region, and the """"""""context"""""""" (surrounding sequences) of binding play important roles generating their specificity. We will initially carry out an extensive characterization of the binding activities. This will include DNAase footprinting, methylation interference assays, as well as others. Once we have defined some of the physical properties of these factors, we will attempt to demonstrate that specific alterations within the DNA effect both DNA-protein binding and also expression of the cloned (altered) gene in CA-77 cells. It will also be necessary to develop an in vitro assay for somatostatin expression and to analyze the partially purified proteins in this system. Our plan is to ultimately purify the factors which appear to be important for somatostatin gene regulation. The second section of the proposal will attempt to introduce improvements in the synthesis of synthetic genes. We will use the somatostatin cDNA as our model system. Using the sythetic gene, we will attempt to produce quantities of the prohormone large enough that crystals can be obtained and X-ray analysis of these crystals can be initiated.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Method to Extend Research in Time (MERIT) Award (R37)
Project #
5R37DK018024-15
Application #
3483235
Study Section
Biochemistry Study Section (BIO)
Project Start
1979-06-01
Project End
1993-05-31
Budget Start
1990-06-01
Budget End
1991-05-31
Support Year
15
Fiscal Year
1990
Total Cost
Indirect Cost
Name
Purdue University
Department
Type
Schools of Earth Sciences/Natur
DUNS #
072051394
City
West Lafayette
State
IN
Country
United States
Zip Code
47907
Banerjee, Sourav; Ji, Chenggong; Mayfield, Joshua E et al. (2018) Ancient drug curcumin impedes 26S proteasome activity by direct inhibition of dual-specificity tyrosine-regulated kinase 2. Proc Natl Acad Sci U S A 115:8155-8160
Qiu, Yimin; Poppleton, Erik; Mekkat, Arya et al. (2018) Enzymatic Phosphorylation of Ser in a Type I Collagen Peptide. Biophys J 115:2327-2335
Nguyen, Kim B; Sreelatha, Anju; Durrant, Eric S et al. (2016) Phosphorylation of spore coat proteins by a family of atypical protein kinases. Proc Natl Acad Sci U S A 113:E3482-91
Tagliabracci, Vincent S; Wiley, Sandra E; Guo, Xiao et al. (2015) A Single Kinase Generates the Majority of the Secreted Phosphoproteome. Cell 161:1619-32
Cui, Jixin; Xiao, Junyu; Tagliabracci, Vincent S et al. (2015) A secretory kinase complex regulates extracellular protein phosphorylation. Elife 4:e06120
Wen, Jianzhong; Xiao, Junyu; Rahdar, Meghdad et al. (2014) Xylose phosphorylation functions as a molecular switch to regulate proteoglycan biosynthesis. Proc Natl Acad Sci U S A 111:15723-8
Worby, Carolyn A; Dixon, Jack E (2014) PTEN. Annu Rev Biochem 83:641-69
Bahmanyar, Shirin; Biggs, Ronald; Schuh, Amber L et al. (2014) Spatial control of phospholipid flux restricts endoplasmic reticulum sheet formation to allow nuclear envelope breakdown. Genes Dev 28:121-6
Bordoli, Mattia R; Yum, Jina; Breitkopf, Susanne B et al. (2014) A secreted tyrosine kinase acts in the extracellular environment. Cell 158:1033-1044
Tagliabracci, Vincent S; Engel, James L; Wiley, Sandra E et al. (2014) Dynamic regulation of FGF23 by Fam20C phosphorylation, GalNAc-T3 glycosylation, and furin proteolysis. Proc Natl Acad Sci U S A 111:5520-5

Showing the most recent 10 out of 57 publications