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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
Published on: July 14, 2015
Glycine residues provide flexibility for enzyme active sites
1Institute of Microbiology, National Laboratory of Microbial Technology, Shandong University, Jinan 250100, China.
The Journal of Biological Chemistry
|February 7, 1997
Summary
Enzyme active sites are rich in specific amino acid sequences (G-X-Y/Y-X-G) that may enable flexibility and formation. These motifs, featuring small, low-polarity residues, are crucial for enzyme function.
Area of Science:
- Biochemistry
- Structural Biology
- Enzymology
Background:
- Enzyme active sites are critical for biological catalysis.
- Understanding the structural properties of active sites can reveal mechanisms of enzyme function.
- Specific amino acid sequences may dictate active site conformation and flexibility.
Purpose of the Study:
- To analyze the properties of amino acids within the active sites of 23 high-resolution enzyme structures.
- To identify recurring amino acid sequence motifs in enzyme active regions.
- To investigate the potential role of these motifs in enzyme structure and function.
Main Methods:
- High-resolution structural analysis of 23 distinct enzyme molecules.
- Identification and quantification of amino acid oligopeptides within active site regions.
- Comparison of sequence composition between active sites and other enzyme regions.
Main Results:
- Enzyme active sites show a significantly higher frequency of G-X-Y and Y-X-G oligopeptides compared to other enzyme regions.
- Residues X and Y in these motifs are characterized as small, polar, and non-polar with low polarity.
- Glycine residues appear to confer necessary flexibility for active site conformational changes.
Conclusions:
- The G-X-Y/Y-X-G oligopeptide sequence is a potential motif for enzyme active site formation.
- Glycine's role in providing flexibility is crucial for enzyme active site adaptability.
- These findings contribute to understanding the structural basis of enzyme catalysis and specificity.
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