Characterization and crystal structure of lysine insensitive Corynebacterium glutamicum dihydrodipicolinate synthase (cDHDPS) protein
| Autor: | Elena A. Rice, Gary A. Bannon, Eric J. Sturman, Timothy J. Rydel, Soon Seog Jeong, Kevin C. Glenn |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Dihydrodipicolinate synthase
Stereochemistry Molecular Sequence Data Allosteric regulation Lysine Biophysics Crystallography X-Ray Models Biological complex mixtures Biochemistry Corynebacterium glutamicum Inhibitory Concentration 50 Catalytic Domain Escherichia coli Humans Amino Acid Sequence Binding site Molecular Biology Hydro-Lyases chemistry.chemical_classification Sequence Homology Amino Acid biology Active site Lyase Protein Structure Tertiary Amino acid Kinetics chemistry biology.protein bacteria Electrophoresis Polyacrylamide Gel |
| Zdroj: | Archives of Biochemistry and Biophysics. 480:111-121 |
| ISSN: | 0003-9861 |
| Popis: | The lysine insensitive Corynebacterium glutamicum dihydrodipicolinate synthase enzyme (cDHDPS) was recently successfully introduced into maize plants to enhance the level of lysine in the grain. To better understand lysine insensitivity of the cDHDPS, we expressed, purified, kinetically characterized the protein, and solved its X-ray crystal structure. The cDHDPS enzyme has a fold and overall structure that is highly similar to other DHDPS proteins. A noteworthy feature of the active site is the evidence that the catalytic lysine residue forms a Schiff base adduct with pyruvate. Analyses of the cDHDPS structure in the vicinity of the putative binding site for S-lysine revealed that the allosteric binding site in the Escherichia coli DHDPS protein does not exist in cDHDPS due to three non-conservative amino acids substitutions, and this is likely why cDHDPS is not feedback inhibited by lysine. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect