Publication: Characterization of Plasmodium falciparum serine hydroxymethyltransferase-A potential antimalarial target
2
Issued Date
2009-11-01
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ISSN
01666851
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2-s2.0-68949187841
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Mahidol University
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SCOPUS
Bibliographic Citation
Molecular and Biochemical Parasitology. Vol.168, No.1 (2009), 63-73
Suggested Citation
Somchart Maenpuen, Kittipat Sopitthummakhun, Yongyuth Yuthavong, Pimchai Chaiyen, Ubolsree Leartsakulpanich Characterization of Plasmodium falciparum serine hydroxymethyltransferase-A potential antimalarial target. Molecular and Biochemical Parasitology. Vol.168, No.1 (2009), 63-73. doi:10.1016/j.molbiopara.2009.06.010 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/27125
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Title
Characterization of Plasmodium falciparum serine hydroxymethyltransferase-A potential antimalarial target
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Abstract
Serine hydroxymethyltransferase (SHMT) is a ubiquitous enzyme required for folate recycling and dTMP synthesis. A cDNA encoding Plasmodium falciparum (Pf) SHMT was expressed as a hexa-histidine tagged protein in Escherichia coli BL21-CodonPlus®(DE3)-RIL. The protein was purified and the process yielded 3.6 mg protein/l cell culture. Recombinant His6-tagged PfSHMT exhibits a visible spectrum characteristic of pyridoxal-5′-phosphate enzyme and catalyzes the reversible conversion of l-serine and tetrahydrofolate (H4folate) to glycine and 5,10-methylenetetrahydrofolate (CH2-H4folate). Steady-state kinetics study indicates that His6-tagged PfSHMT catalyzes the reaction by a ternary-complex mechanism. The sequence of substrate binding to the enzyme was also examined by glycine product inhibition. A striking property that is unique for His6-tagged PfSHMT is the ability to use d-serine as a substrate in the folate-dependent serine-glycine conversion. Kinetic data in combination with expression result support the proposal of SHMT reaction being a regulatory step for dTMP cycle. This finding suggests that PfSHMT can be a potential target for antimalarial chemotherapy. © 2009 Elsevier B.V.