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Leishmania species: Evidence for transglutaminase activity and its role in parasite proliferation

Albeit transglutaminase (TGase) activity has been reported to play crucial physiological roles in several organisms including parasites; however, there was no previous report(s) whether Leishmania parasites exhibit this activity. We demonstrate herein that TGase is functionally active in Leishmania...

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Published in:Experimental parasitology 2006-10, Vol.114 (2), p.94-102
Main Authors: Brobey, Reynolds K.B., Soong, Lynn
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description Albeit transglutaminase (TGase) activity has been reported to play crucial physiological roles in several organisms including parasites; however, there was no previous report(s) whether Leishmania parasites exhibit this activity. We demonstrate herein that TGase is functionally active in Leishmania parasites by using labeled polyamine that becomes conjugated into protein substrates. The parasite enzyme was about 2- to 4-fold more abundant in Old World species than in New World ones. In L. amazonensis, comparable TGase activity was found in both promastigotes and amastigotes. TGase activity in either parasite stage was optimal at the basic pH, but the enzyme in amastigote lysates was more stable at higher temperatures (37–55 °C) than that in promastigote lysates. Leishmania TGase differs from mouse macrophage (MΦ) TGase in two ways: (1) the parasite enzyme is Ca 2+-independent, whereas the mammalian TGase depends on the cation for activity, and (2) major protein substrates for L. amazonensis TGase were found within the 50–75 kDa region, while those for the MΦ TGase were located within 37–50 kDa. The potential contribution of TGase-catalyzed reactions in promastigote proliferation was supported by findings that standard inhibitors of TGase [e.g., monodansylcadaverine (MDC), cystamine (CS), and iodoacetamide (IodoA)], but not didansylcadaverine (DDC), a close analogue of MDC, had a profound dose-dependent inhibition on parasite growth. Myo-inositol-1-phosphate synthase and leishmanolysin (gp63) were identified as possible endogenous substrates for L. amazonensis TGase, implying a role for TGase in parasite growth, development, and survival.
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We demonstrate herein that TGase is functionally active in Leishmania parasites by using labeled polyamine that becomes conjugated into protein substrates. The parasite enzyme was about 2- to 4-fold more abundant in Old World species than in New World ones. In L. amazonensis, comparable TGase activity was found in both promastigotes and amastigotes. TGase activity in either parasite stage was optimal at the basic pH, but the enzyme in amastigote lysates was more stable at higher temperatures (37–55 °C) than that in promastigote lysates. Leishmania TGase differs from mouse macrophage (MΦ) TGase in two ways: (1) the parasite enzyme is Ca 2+-independent, whereas the mammalian TGase depends on the cation for activity, and (2) major protein substrates for L. amazonensis TGase were found within the 50–75 kDa region, while those for the MΦ TGase were located within 37–50 kDa. 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The potential contribution of TGase-catalyzed reactions in promastigote proliferation was supported by findings that standard inhibitors of TGase [e.g., monodansylcadaverine (MDC), cystamine (CS), and iodoacetamide (IodoA)], but not didansylcadaverine (DDC), a close analogue of MDC, had a profound dose-dependent inhibition on parasite growth. 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Pathogenesis</topic><topic>macrophage</topic><topic>Macrophages - enzymology</topic><topic>MDC</topic><topic>MES</topic><topic>Mice</topic><topic>Mice, Inbred BALB C</topic><topic>monodansylcadaverine</topic><topic>Parasite</topic><topic>posttranslational modification</topic><topic>Promastigote</topic><topic>Protozoa</topic><topic>PTM</topic><topic>Temperature</topic><topic>TGase</topic><topic>transglutaminase</topic><topic>Transglutaminase (EC 2.3.2.13)</topic><topic>Transglutaminases - analysis</topic><topic>Transglutaminases - antagonists &amp; inhibitors</topic><topic>Transglutaminases - physiology</topic><topic>Trypanosomatid</topic><topic>Western blot</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Brobey, Reynolds K.B.</creatorcontrib><creatorcontrib>Soong, Lynn</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>MEDLINE - Academic</collection><jtitle>Experimental parasitology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Brobey, Reynolds K.B.</au><au>Soong, Lynn</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Leishmania species: Evidence for transglutaminase activity and its role in parasite proliferation</atitle><jtitle>Experimental parasitology</jtitle><addtitle>Exp Parasitol</addtitle><date>2006-10-01</date><risdate>2006</risdate><volume>114</volume><issue>2</issue><spage>94</spage><epage>102</epage><pages>94-102</pages><issn>0014-4894</issn><eissn>1090-2449</eissn><coden>EXPAAA</coden><abstract>Albeit transglutaminase (TGase) activity has been reported to play crucial physiological roles in several organisms including parasites; however, there was no previous report(s) whether Leishmania parasites exhibit this activity. We demonstrate herein that TGase is functionally active in Leishmania parasites by using labeled polyamine that becomes conjugated into protein substrates. The parasite enzyme was about 2- to 4-fold more abundant in Old World species than in New World ones. In L. amazonensis, comparable TGase activity was found in both promastigotes and amastigotes. TGase activity in either parasite stage was optimal at the basic pH, but the enzyme in amastigote lysates was more stable at higher temperatures (37–55 °C) than that in promastigote lysates. Leishmania TGase differs from mouse macrophage (MΦ) TGase in two ways: (1) the parasite enzyme is Ca 2+-independent, whereas the mammalian TGase depends on the cation for activity, and (2) major protein substrates for L. amazonensis TGase were found within the 50–75 kDa region, while those for the MΦ TGase were located within 37–50 kDa. The potential contribution of TGase-catalyzed reactions in promastigote proliferation was supported by findings that standard inhibitors of TGase [e.g., monodansylcadaverine (MDC), cystamine (CS), and iodoacetamide (IodoA)], but not didansylcadaverine (DDC), a close analogue of MDC, had a profound dose-dependent inhibition on parasite growth. Myo-inositol-1-phosphate synthase and leishmanolysin (gp63) were identified as possible endogenous substrates for L. amazonensis TGase, implying a role for TGase in parasite growth, development, and survival.</abstract><cop>San Diego, CA</cop><pub>Elsevier Inc</pub><pmid>16620812</pmid><doi>10.1016/j.exppara.2006.02.021</doi><tpages>9</tpages></addata></record>
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subjects 2-[ N-morpholino]ethanesulfonic acid
Amastigote
Animals
BCA
bicinchonic acid
Biological and medical sciences
Blotting, Western
Cadaverine - analogs & derivatives
Cadaverine - pharmacology
Cells, Cultured
Colorimetry
cystamine
Cystamine - pharmacology
DDC
didansylcadaverine
Enzyme Inhibitors - pharmacology
fluorescein cadaverine
Fundamental and applied biological sciences. Psychology
Glycoconjugates
Hydrogen-Ion Concentration
Inhibition
IodoA
iodoacetamide
Iodoacetamide - pharmacology
Leishmania
Leishmania - drug effects
Leishmania - enzymology
Leishmania - growth & development
Leishmania infantum - drug effects
Leishmania infantum - enzymology
Leishmania infantum - growth & development
Leishmania major - drug effects
Leishmania major - enzymology
Leishmania major - growth & development
Leishmania mexicana - drug effects
Leishmania mexicana - enzymology
Leishmania mexicana - growth & development
Life cycle. Host-agent relationship. Pathogenesis
macrophage
Macrophages - enzymology
MDC
MES
Mice
Mice, Inbred BALB C
monodansylcadaverine
Parasite
posttranslational modification
Promastigote
Protozoa
PTM
Temperature
TGase
transglutaminase
Transglutaminase (EC 2.3.2.13)
Transglutaminases - analysis
Transglutaminases - antagonists & inhibitors
Transglutaminases - physiology
Trypanosomatid
Western blot
title Leishmania species: Evidence for transglutaminase activity and its role in parasite proliferation
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