Molecular characterization of a prolyl endopeptidase from a feather-degrading thermophile Meiothermus ruber H328
Related Experiment Video
Updated: Aug 7, 2026
Purification of Hsp104, a Protein Disaggregase
Published on: September 30, 2011
Fumi Yamamoto1, Hironobu Morisaka2, Mitsuyoshi Ueda2
1Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Shimogamo, Sakyo, Kyoto 606-8522, Japan.
Abstract:
Prolyl endopeptidase from an aerobic and Gram-negative thermophile Meiothermus ruber H328 (MrPEP) was purified in native and recombinant forms, but both preparations had comparable characteristics. Production of the native MrPEP was increased 10-fold by adding intact chicken feathers. The gene for MrPEP (mrH_2860) was cloned from the genome of strain H328 and found to have no signal sequence at the N-terminus. MrPEP is composed of two major domains: the β-propeller domain and the peptidase domain with a typical active site motif and catalytic triad. Based on extensive investigations with different types of peptide substrates and FRETS-25Xaa libraries, MrPEP showed strict preferences for Pro residue at the P1 position but broader preferences at the P2 and P3 positions in substrate specificity with stronger affinity for residues at the P3 position of substrate peptides that are longer than four residues in length. In conclusion, the molecular characterization of MrPEP resembles its animal counterparts more closely than bacterial counterparts in function and structure.
Insights
This study characterizes prolyl endopeptidase (MrPEP) from the thermophile Meiothermus ruber. MrPEP
Area of Science:
- Biochemistry
- Enzymology
- Microbial biotechnology
Background:
- Prolyl endopeptidases (PEPs) are crucial enzymes involved in protein processing.
- Characterizing novel PEPs from thermophilic bacteria can reveal unique enzymatic properties and industrial applications.
Purpose of the Study:
- To purify and characterize prolyl endopeptidase (MrPEP) from the thermophilic bacterium Meiothermus ruber H328.
- To investigate the gene structure, protein domains, and substrate specificity of MrPEP.
Main Methods:
- Purification of native and recombinant MrPEP.
- Gene cloning and sequencing of the mrH_2860 gene.
- Enzyme activity assays using various peptide substrates and FRETS-25Xaa libraries.
- Structural analysis of protein domains.
Main Results:
- Native and recombinant MrPEP exhibited comparable characteristics.
- Production of native MrPEP was significantly enhanced (10-fold) by the addition of chicken feathers.
- MrPEP possesses a β-propeller domain and a peptidase domain with a catalytic triad.
- MrPEP demonstrated strict P1 Pro residue preference and broader P2/P3 preferences, with higher affinity for longer peptides.
Conclusions:
- The molecular and functional characteristics of MrPEP align more closely with animal PEPs than bacterial counterparts.
- MrPEP represents a potential candidate for biotechnological applications requiring thermostable enzymes with specific substrate cleavage properties.
More Related Videos
13:34Production, Crystallization and Structure Determination of C. difficile PPEP-1 via Microseeding and Zinc-SAD
Published on: December 30, 2016
11:27X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050
Published on: May 13, 2020
