Our long-term objective in this investigation is to delineate the critical three-dimensional structural features which are required for the control of specificity and the generation of reactivity in both co- and post-translational modification reaction. We plan to initiate our investigations with the in-depth examination of the following enzyme catalyzed derivatization reactions; the N- asparagine-linked glycosylation, mediated by glycosyl transferases, and the cAMP-dependent phosphorylation mediated by a protein kinase. The first process is co-translational and the second post- translational. Since enzyme-cataly derivatization of proteins is central to innumerable biological control processes, an understanding of the manner in which specificity is achieved in these reactions is of clear importance both to fundamental biochemistry and in a practical consideration of the mechanisms of homeostatic control. The experimental approach in the investigation is a multidisciplinary one and incorporates both the design and synthesis of substrate analogues of well-defined three-dimensional structure, as well as the investigation of these analogues using biochemical techniques. The substrate analogues would, in the initial phase be based on peptidyl structures, which incorporate features such as conformational restrictions, reporter groups or affinity labels. From the information obtained from this phase of the work we could then design and synthesize non-peptidyl mimics of the modified sequences. In these compounds we could truly identify the precise features controlling recognition independent of the supporting peptide framework.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
First Independent Research Support & Transition (FIRST) Awards (R29)
Project #
5R29GM039334-05
Application #
3466692
Study Section
Biochemistry Study Section (BIO)
Project Start
1989-09-01
Project End
1993-01-31
Budget Start
1991-02-01
Budget End
1992-01-31
Support Year
5
Fiscal Year
1991
Total Cost
Indirect Cost
Name
California Institute of Technology
Department
Type
Schools of Engineering
DUNS #
078731668
City
Pasadena
State
CA
Country
United States
Zip Code
91125
Musial-Siwek, Monika; Jaffee, Marcie B; Imperiali, Barbara (2016) Probing Polytopic Membrane Protein-Substrate Interactions by Luminescence Resonance Energy Transfer. J Am Chem Soc 138:3806-12
Lukose, Vinita; Luo, Lingqi; Kozakov, Dima et al. (2015) Conservation and Covariance in Small Bacterial Phosphoglycosyltransferases Identify the Functional Catalytic Core. Biochemistry 54:7326-34
Whitworth, Garrett E; Imperiali, Barbara (2015) Selective biochemical labeling of Campylobacter jejuni cell-surface glycoconjugates. Glycobiology 25:756-66
Lukose, Vinita; Whitworth, Garrett; Guan, Ziqiang et al. (2015) Chemoenzymatic Assembly of Bacterial Glycoconjugates for Site-Specific Orthogonal Labeling. J Am Chem Soc 137:12446-9
Chang, Michelle M; Imperiali, Barbara; Eichler, Jerry et al. (2015) N-Linked Glycans Are Assembled on Highly Reduced Dolichol Phosphate Carriers in the Hyperthermophilic Archaea Pyrococcus furiosus. PLoS One 10:e0130482
Jaffee, Marcie B; Imperiali, Barbara (2013) Optimized protocol for expression and purification of membrane-bound PglB, a bacterial oligosaccharyl transferase. Protein Expr Purif 89:241-50
Larkin, Angelyn; Chang, Michelle M; Whitworth, Garrett E et al. (2013) Biochemical evidence for an alternate pathway in N-linked glycoprotein biosynthesis. Nat Chem Biol 9:367-73
Hartley, Meredith D; Schneggenburger, Philipp E; Imperiali, Barbara (2013) Lipid bilayer nanodisc platform for investigating polyprenol-dependent enzyme interactions and activities. Proc Natl Acad Sci U S A 110:20863-70
Hartley, Meredith D; Imperiali, Barbara (2012) At the membrane frontier: a prospectus on the remarkable evolutionary conservation of polyprenols and polyprenyl-phosphates. Arch Biochem Biophys 517:83-97
Larkin, Angelyn; Imperiali, Barbara (2011) The expanding horizons of asparagine-linked glycosylation. Biochemistry 50:4411-26

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