The biosynthesis of insulin proceeds through a precursor protein, proinsulin. This larger protein (86 residues) folds to form three native disulfide bonds, which are retained in the proteolytic 2-chain fragment, insulin. Unfortunately, proinsulin is refractory to crystallization under all conditions successfully applied to insulin itself. The absence of structural information has blocked efforts to understand the role of the C-peptide and the targets for cleavage by the converting enzymes. We therefore propose to determine the solution structure of human proinsulin. Preliminary results strongly suggest that this can be accomplished using the Zn-coordinated hexamer at 55xC and pH 7. The thermal stability and structural rigidity of the hexamer provide high-resolution spectra to be obtained under these conditions. Because of the limited resolution in spin systems at the junctions between the connecting peptide and the A- and B-domains (sites of biological recognition by converting enzymes) and because isotopic labeling is impeded by inefficient expression in E. coli, we seek to obtain homonuclear data at the highest field strength.

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
5P41RR002301-18
Application #
6575291
Study Section
Project Start
2002-03-01
Project End
2003-02-28
Budget Start
Budget End
Support Year
18
Fiscal Year
2002
Total Cost
Indirect Cost
Name
University of Wisconsin Madison
Department
Type
DUNS #
161202122
City
Madison
State
WI
Country
United States
Zip Code
53715
Wales, Jessica A; Chen, Cheng-Yu; Breci, Linda et al. (2018) Discovery of stimulator binding to a conserved pocket in the heme domain of soluble guanylyl cyclase. J Biol Chem 293:1850-1864
Travers, Timothy; López, Cesar A; Van, Que N et al. (2018) Molecular recognition of RAS/RAF complex at the membrane: Role of RAF cysteine-rich domain. Sci Rep 8:8461
Thomas, Nathan E; Wu, Chao; Morrison, Emma A et al. (2018) The C terminus of the bacterial multidrug transporter EmrE couples drug binding to proton release. J Biol Chem 293:19137-19147
Assadi-Porter, Fariba M; Radek, James; Rao, Hongyu et al. (2018) Multimodal Ligand Binding Studies of Human and Mouse G-Coupled Taste Receptors to Correlate Their Species-Specific Sweetness Tasting Properties. Molecules 23:
Wijayatunga, Nadeeja N; Sams, Valerie G; Dawson, John A et al. (2018) Roux-en-Y gastric bypass surgery alters serum metabolites and fatty acids in patients with morbid obesity. Diabetes Metab Res Rev 34:e3045
Assadi-Porter, Fariba M; Reiland, Hannah; Sabatini, Martina et al. (2018) Metabolic Reprogramming by 3-Iodothyronamine (T1AM): A New Perspective to Reverse Obesity through Co-Regulation of Sirtuin 4 and 6 Expression. Int J Mol Sci 19:
Dominguez, Eddie; Zarnowski, Robert; Sanchez, Hiram et al. (2018) Conservation and Divergence in the Candida Species Biofilm Matrix Mannan-Glucan Complex Structure, Function, and Genetic Control. MBio 9:
Franco, Aldo; Dovell, Sanaz; Möller, Carolina et al. (2018) Structural plasticity of mini-M conotoxins - expression of all mini-M subtypes by Conus regius. FEBS J 285:887-902
Selen Alpergin, Ebru S; Bolandnazar, Zeinab; Sabatini, Martina et al. (2017) Metabolic profiling reveals reprogramming of lipid metabolic pathways in treatment of polycystic ovary syndrome with 3-iodothyronamine. Physiol Rep 5:
Mong, Surin K; Cochran, Frank V; Yu, Hongtao et al. (2017) Heterochiral Knottin Protein: Folding and Solution Structure. Biochemistry 56:5720-5725

Showing the most recent 10 out of 613 publications