Abstract：
:Serine hydroxymethyltransferase belongs to the class of pyridoxal-5-phosphate enzymes along with aspartate aminotransferase. To explore the function of residue(s) involved in binding of the carboxylate group of Tetrahydrofolic acid (THF) to L. donovani cytosolic serine hydroxymethyltransferase (LdcSHMT), the gene was cloned in pET-28(a) vector, overexpressed and purified to homogeneity. With the help of docking results of THF to the active site of protein, the key residues involved in interaction were identified. In an attempt to unravel the function of Arg265 residue involved in binding of the carboxylate group of THF, Arg-265 was mutated to Ala by site-directed mutagenesis. The Arg265Ala-LdcSHMT showed increased Km value (threefold) and decreased kcat/Km value (threefold) for H₄-folate as compared with wild type enzyme. The wild and mutant enzymes exhibited similar Km and kcat/Km values for L-allo-threonine. Unlike the wild type enzyme, mutant failed to form characteristic quinonoid intermediate and was unable to carry out the exchange of α-proton from glycine in the presence of Tetrahydrofolate. These results suggested that Arg265 residue is required for the binding of Tetrahydrofolate and may be the base that abstracts α-proton from glycine, leading to formation of quinonoid intermediate in cytosolic SHMT of L. donovani.
journal_name
Exp Parasitoljournal_title
Experimental parasitologyauthors
Gandhi S,Gaur N,Krishna S,Siddiqi MI,Saxena JKdoi
10.1016/j.exppara.2014.12.004subject
Has Abstractpub_date
2015-02-01 00:00:00pages
16-23eissn
0014-4894issn
1090-2449pii
S0014-4894(14)00274-4journal_volume
149pub_type
杂志文章abstract：:According to the World Health Organization, lymphatic filariasis (LF), a mosquito-borne neglected tropical disease (NTD), should be eliminated as a public health concern by the end of 2020. To this end, the goals of the Global Programme to Eliminate Lymphatic Filariasis (GPELF) include interrupting transmission throug...
journal_title：Experimental parasitology
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journal_title：Experimental parasitology
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journal_title：Experimental parasitology
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journal_title：Experimental parasitology
pub_type： 杂志文章
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journal_title：Experimental parasitology
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abstract：:Leishmaniasis are globally widespread parasitic diseases which often leads to death if left untreated. Currently available drugs present different drawbacks, so there is an urgent need to develop new, safe and cost-effective drugs against leishmaniasis. In this study we tested a small library of trans-stilbene and ter...
journal_title：Experimental parasitology
pub_type： 杂志文章
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journal_title：Experimental parasitology
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2018.03.002
更新日期：2018-04-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2016.04.013
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journal_title：Experimental parasitology
pub_type： 杂志文章
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journal_title：Experimental parasitology
pub_type： 杂志文章
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2018.09.002
更新日期：2018-10-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/0014-4894(85)90024-4
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2004.12.006
更新日期：2005-03-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/0014-4894(83)90059-0
更新日期：1983-10-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2003.09.001
更新日期：2003-10-01 00:00:00
abstract：:The effects of azadirachtin and ecdysone on the Trypanosoma cruzi population in the Rhodnius prolixus gut were investigated. T. cruzi were rarely found in the gut compartments of azadirachtin-treated larvae. High parasite numbers were observed in the stomach of the control and ecdysone groups until 10 days after treat...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2012.05.005
更新日期：2012-07-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
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更新日期：1991-10-01 00:00:00
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journal_title：Experimental parasitology
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doi：10.1016/j.exppara.2009.01.016
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journal_title：Experimental parasitology
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更新日期：2015-06-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2011.12.007
更新日期：2012-03-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2009.10.015
更新日期：2010-09-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
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更新日期：1987-12-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1006/expr.1994.1030
更新日期：1994-05-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
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更新日期：1988-12-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1006/expr.1994.1028
更新日期：1994-05-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2007.07.003
更新日期：2008-02-01 00:00:00
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journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2005.09.006
更新日期：2006-02-01 00:00:00
abstract：:Chlorination is a well-known disinfection method, used in water treatment to inactivate various microorganisms, it induces numerous cellular changes. Even though Acanthamoebae are frequently found in water, the cellular changes induced in Acanthamoebae have not been described in the literature. Acanthamoebae are patho...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2009.12.005
更新日期：2010-09-01 00:00:00
abstract：:The transport of the megadalton protein Pf332 was studied during the asexual bloodstage development of Plasmodium falciparum. Four mouse monoclonal antibodies, produced against a recombinant polypeptide derived from the Pf332 protein, were used to analyze the kinetics of synthesis, the subcellular location, and transp...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1006/expr.1994.1091
更新日期：1994-11-01 00:00:00
