The objectives of the proposed research are: To bring about new methodology for the selective use of PLP as a specific modifying agent of other proteins in solution or membranes. To develop methods to determine the solution properties of amino acid residues at active sites in both free enzymes and enzyme-substrate complexes. To identify the role of structural groups other than the aldehyde and amino groups in the coenzyme in enzyme-coenzyme relationships and even their plausible implication in enzymatic function for enzyme catalyzing different types of reactions. To characterize those amino acids constituting the active center of selected examples of phosphopyridoxal dependent enzymes. To clarify the role of those amino acids (point d) in enzyme-coenzyme-substrate relationships and the mechanism of catalysis. To detect the effects ellicited by interacting proteins on the microenvironment of strategic protein regions of the PLP-dependent protein or on groups within the bound pyridoxal phosphate (PLP) or pyridoxamine phosphate (PMP) molecules. To exploit the preference for PLP by non PLP-requiring proteins to further our knowledge of localized perturbations resulting from ligand interactions with the protein during heterotopic protein-protein interactions.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM038184-02
Application #
3294319
Study Section
Biochemistry Study Section (BIO)
Project Start
1986-09-01
Project End
1989-03-31
Budget Start
1987-04-01
Budget End
1989-03-31
Support Year
2
Fiscal Year
1987
Total Cost
Indirect Cost
Name
University of Missouri Kansas City
Department
Type
Overall Medical
DUNS #
800772162
City
Kansas City
State
MO
Country
United States
Zip Code
64110
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Artigues, A; Iriarte, A; Martinez-Carrion, M (1994) Acid-induced reversible unfolding of mitochondrial aspartate aminotransferase. J Biol Chem 269:21990-9
Mattingly Jr, J R; Youssef, J; Iriarte, A et al. (1993) Protein folding in a cell-free translation system. The fate of the precursor to mitochondrial aspartate aminotransferase. J Biol Chem 268:3925-37
Reyes, A M; Iriarte, A; Martinez-Carrion, M (1993) Refolding of the precursor and mature forms of mitochondrial aspartate aminotransferase after guanidine hydrochloride denaturation. J Biol Chem 268:22281-91
Mattingly Jr, J R; Iriarte, A; Martinez-Carrion, M (1993) Structural features which control folding of homologous proteins in cell-free translation systems. The effect of a mitochondrial-targeting presequence on aspartate aminotransferase. J Biol Chem 268:26320-7
Sanchez-Ruiz, J M; Iriarte, A; Martinez-Carrion, M (1991) The ionization states of the 5'-phosphate group in the various coenzyme forms bound to mitochondrial aspartate aminotransferase. Arch Biochem Biophys 286:38-45
Altieri, F; Mattingly Jr, J R; Rodriguez-Berrocal, F J et al. (1989) Isolation and properties of a liver mitochondrial precursor protein to aspartate aminotransferase expressed in Escherichia coli. J Biol Chem 264:4782-6
Sanchez-Ruiz, J M; Martinez-Carrion, M (1988) A Fourier-transform infrared spectroscopic study of the phosphoserine residues in hen egg phosvitin and ovalbumin. Biochemistry 27:3338-42
Roberts, W J; Hubert, E; Iriarte, A et al. (1988) Site-specific methylation of a strategic lysyl residue in aspartate aminotransferase. J Biol Chem 263:7196-202