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Crystallization and preliminary X-ray diffraction data for a purple acid phosphatase from sweet potato
G Schenk1, L E Carrington, S E Hamilton
1Department of Biochemistry, The University of Queensland, Brisbane, QLD 4072, Australia.
Acta Crystallographica. Section D, Biological Crystallography
|February 10, 2000
Summary
Sweet potato purple acid phosphatase (PAP) was studied. A novel Fe-Mn metal center was identified in this enzyme, offering new insights into its structure and function.
Area of Science:
- Biochemistry
- Structural Biology
- Enzymology
Background:
- Purple acid phosphatases (PAPs) are enzymes involved in various biological processes.
- Two isoforms of sweet potato PAP have been identified, differing in their metal composition.
- One known isoform contains an Fe-Zn center, while another contains an Fe-Mn center.
Purpose of the Study:
- To characterize the Fe-Mn containing isoform of sweet potato purple acid phosphatase.
- To determine the crystal structure of the Fe-Mn containing sweet potato PAP.
- To elucidate the coordination of the novel binuclear metal center.
Main Methods:
- Crystallization of the Fe-Mn containing sweet potato PAP using PEG 6000.
- X-ray diffraction data collection from a cryocooled crystal to 2.90 A resolution.
- Analysis of crystal unit-cell parameters and space group symmetry (P6(5)22).
Main Results:
- Crystals of the Fe-Mn containing sweet potato PAP were successfully grown.
- The crystal structure was determined to a resolution of 2.90 A.
- This study confirms the existence of an Fe-Mn binuclear metal center in this enzyme isoform.
Conclusions:
- The Fe-Mn containing sweet potato PAP represents a novel class of purple acid phosphatases.
- The determined three-dimensional structure provides crucial insights into the coordination of the Fe-Mn metal center.
- This research expands our understanding of metalloenzyme diversity and function.