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Crystallization and characterization of the prolidase from Pyrococcus furiosus
K Willingham1, M J Maher, A M Grunden
1Department of Biochemistry, University of Sydney, NSW 2006, Australia.
Acta Crystallographica. Section D, Biological Crystallography
|February 27, 2001
Summary
Crystallization of prolidase from Pyrococcus furiosus revealed a homodimeric structure requiring cobalt for activity. Two crystal forms were analyzed, providing insights into the enzyme
Area of Science:
- Biochemistry
- Structural Biology
- Archaea Research
Background:
- Prolidase is a proline-specific dipeptidase crucial for collagen metabolism.
- The hyperthermophilic archaeon Pyrococcus furiosus offers a unique source for thermostable enzymes.
- Understanding enzyme structure is key to elucidating function and engineering.
Purpose of the Study:
- To determine the crystal structure of Pyrococcus furiosus prolidase.
- To investigate the structural requirements for prolidase activity, including metal ion cofactors.
- To characterize different crystalline forms of the enzyme.
Main Methods:
- Crystallization of Pyrococcus furiosus prolidase.
- X-ray diffraction analysis of two crystal forms (Form I and Form II).
- Determination of unit-cell parameters and space group (P2(1)).
Main Results:
- Prolidase from P. furiosus was crystallized in two distinct monoclinic forms.
- The enzyme exists as a homodimer and requires two cobalt atoms per subunit for optimal activity.
- Diffraction data were collected to high resolution (3.2 A for Form I, 1.95 A for Form II).
Conclusions:
- The study provides structural insights into a thermostable prolidase.
- The characterization of two crystal forms aids in structure determination and understanding crystal packing.
- The findings highlight the importance of cobalt ions for prolidase function in this archaeon.