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Poly(aspartic acid) (PAA) hydrolases and PAA biodegradation: current knowledge and impact on applications
1Bioengineering Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan. thiraish@riken.jp.
Applied Microbiology and Biotechnology
|December 24, 2015
Summary
Poly(aspartic acid) (PAA) hydrolases are enzymes that biodegrade PAA. PAA hydrolase-1 shows unique reactivity, making it a promising biocatalyst for synthesizing β-peptides.
Area of Science:
- Biochemistry
- Polymer Science
- Enzymology
Background:
- Thermally synthesized poly(aspartic acid) (tPAA) is a biodegradable, water-soluble polymer.
- tPAA contains a high proportion of β-Asp units and equal D- and L-Asp units.
Purpose of the Study:
- To review poly(aspartic acid) (PAA) hydrolases, focusing on PAA hydrolase-1.
- To explore the biochemical and functional properties of PAA hydrolases.
- To provide insights into the catalytic mechanisms of PAA hydrolase-1.
Main Methods:
- Purification of PAA hydrolase-1 and hydrolase-2 from Gram-negative bacteria.
- Biochemical characterization of PAA hydrolases.
- Comparative analysis with related enzymes like poly(R-3-hydroxybutyrate) depolymerases and β-aminopeptidases.
Main Results:
- PAA hydrolase-1 selectively cleaves β-Asp units via an endo-type process.
- PAA hydrolase-2 performs exo-type hydrolysis on products generated by PAA hydrolase-1.
- PAA hydrolase-1 exhibits novel reactivity suitable for biocatalysis.
Conclusions:
- PAA hydrolases play a key role in the biodegradation of tPAA.
- PAA hydrolase-1's unique enzymatic activity presents opportunities for β-peptide synthesis.
- Understanding the catalytic mechanism of PAA hydrolase-1 from Pedobacter sp. KP-2 is crucial for its application.
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