Lipolytic activity of ricin from Ricinus sanguineus and Ricinus communis on neutral lipids.
Identifieur interne : 000228 ( PubMed/Curation ); précédent : 000227; suivant : 000229Lipolytic activity of ricin from Ricinus sanguineus and Ricinus communis on neutral lipids.
Auteurs : S. Lombard [France] ; M E Helmy ; G. PiéroniSource :
- The Biochemical journal [ 0264-6021 ] ; 2001.
English descriptors
- KwdEn :
- Amino Acid Sequence, Castor Bean (metabolism), Consensus Sequence, Dimercaprol (analogs & derivatives), Dimercaprol (metabolism), Esters, Kinetics, Lectins (chemistry), Lectins (metabolism), Lipase (chemistry), Lipase (metabolism), Lipolysis, Plant Lectins, Plants, Toxic, Ricin (chemistry), Ricin (metabolism), Ricinus (metabolism), Sequence Alignment, Substrate Specificity.
- MESH :
- chemical , analogs & derivatives : Dimercaprol.
- chemical , chemistry : Lectins, Lipase, Ricin.
- metabolism : Castor Bean, Dimercaprol, Lectins, Lipase, Ricin, Ricinus.
- Amino Acid Sequence, Consensus Sequence, Esters, Kinetics, Lipolysis, Plant Lectins, Plants, Toxic, Sequence Alignment, Substrate Specificity.
Abstract
The present study was carried out with a view of determining ricin lipolytic activity on neutral lipids in emulsion and in a membrane-like model. Using 2,3-dimercapto-1-propanol tributyrate (BAL-TC(4)) as substrate, the lipolytic activity of ricin was found to be proportional to ricin and substrate concentrations, with an apparent K(m) (K(m,app)) of 2.4 mM, a k(cat) of 200 min(-1) and a specific activity of 1.0 unit/mg of protein. This work was extended to p-nitrophenyl (pNP) fatty acid esters containing two to twelve carbon atoms. Maximum lipolytic activity was registered on pNP decanoate (pNPC(10)), with a K(m,app) of 3.5 mM, a k(cat) of 173 min(-1) and a specific activity of 3.5 units/mg of protein. Ricin lipolytic activity is pH and galactose dependent, with a maximum at pH 7.0 in the presence of 0.2 M galactose. Using the monolayer technique with dicaprin as substrate, ricin showed a lipolytic activity proportional to the ricin concentration at 20 mN/m, which is dependent on the surface pressure of the lipid monolayer and is detectable up to 30 mN/m, a surface pressure that is of the same order of magnitude as that of natural cell membranes. The methods based on pNPC(10) and BAL-TC(4) hydrolysis are simple and reproducible; thus they can be used for routine studies of ricin lipolytic activity. Ricin from Ricinus communis and R. sanguineus were treated with diethyl p-nitrophenylphosphate, an irreversible serine esterase inhibitor, and their lipolytic activities on BAL-TC(4) and pNPC(10), and cytotoxic activity, were concurrently recorded. A reduction in lipolytic activity was accompanied by a decrease in cytotoxicity on Caco2 cells. These data support the idea that the lipolytic activity associated with ricin is relevant to a lipase whose activity is pH and galactose dependent, sensitive to diethyl p-nitrophenylphosphate, and that a lipolytic step may be involved in the process of cell poisoning by ricin. Both colorimetric tests used in this study are sensitive enough to be helpful in the detection of possible lipolytic activities associated with other cytotoxins or lectins.
PubMed: 11535138
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pubmed:11535138Le document en format XML
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<author><name sortKey="Lombard, S" sort="Lombard, S" uniqKey="Lombard S" first="S" last="Lombard">S. Lombard</name>
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<author><name sortKey="Helmy, M E" sort="Helmy, M E" uniqKey="Helmy M" first="M E" last="Helmy">M E Helmy</name>
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<author><name sortKey="Pieroni, G" sort="Pieroni, G" uniqKey="Pieroni G" first="G" last="Piéroni">G. Piéroni</name>
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<term>Dimercaprol (analogs & derivatives)</term>
<term>Dimercaprol (metabolism)</term>
<term>Esters</term>
<term>Kinetics</term>
<term>Lectins (chemistry)</term>
<term>Lectins (metabolism)</term>
<term>Lipase (chemistry)</term>
<term>Lipase (metabolism)</term>
<term>Lipolysis</term>
<term>Plant Lectins</term>
<term>Plants, Toxic</term>
<term>Ricin (chemistry)</term>
<term>Ricin (metabolism)</term>
<term>Ricinus (metabolism)</term>
<term>Sequence Alignment</term>
<term>Substrate Specificity</term>
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<keywords scheme="MESH" type="chemical" qualifier="analogs & derivatives" xml:lang="en"><term>Dimercaprol</term>
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<keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Lectins</term>
<term>Lipase</term>
<term>Ricin</term>
</keywords>
<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Castor Bean</term>
<term>Dimercaprol</term>
<term>Lectins</term>
<term>Lipase</term>
<term>Ricin</term>
<term>Ricinus</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Amino Acid Sequence</term>
<term>Consensus Sequence</term>
<term>Esters</term>
<term>Kinetics</term>
<term>Lipolysis</term>
<term>Plant Lectins</term>
<term>Plants, Toxic</term>
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<front><div type="abstract" xml:lang="en">The present study was carried out with a view of determining ricin lipolytic activity on neutral lipids in emulsion and in a membrane-like model. Using 2,3-dimercapto-1-propanol tributyrate (BAL-TC(4)) as substrate, the lipolytic activity of ricin was found to be proportional to ricin and substrate concentrations, with an apparent K(m) (K(m,app)) of 2.4 mM, a k(cat) of 200 min(-1) and a specific activity of 1.0 unit/mg of protein. This work was extended to p-nitrophenyl (pNP) fatty acid esters containing two to twelve carbon atoms. Maximum lipolytic activity was registered on pNP decanoate (pNPC(10)), with a K(m,app) of 3.5 mM, a k(cat) of 173 min(-1) and a specific activity of 3.5 units/mg of protein. Ricin lipolytic activity is pH and galactose dependent, with a maximum at pH 7.0 in the presence of 0.2 M galactose. Using the monolayer technique with dicaprin as substrate, ricin showed a lipolytic activity proportional to the ricin concentration at 20 mN/m, which is dependent on the surface pressure of the lipid monolayer and is detectable up to 30 mN/m, a surface pressure that is of the same order of magnitude as that of natural cell membranes. The methods based on pNPC(10) and BAL-TC(4) hydrolysis are simple and reproducible; thus they can be used for routine studies of ricin lipolytic activity. Ricin from Ricinus communis and R. sanguineus were treated with diethyl p-nitrophenylphosphate, an irreversible serine esterase inhibitor, and their lipolytic activities on BAL-TC(4) and pNPC(10), and cytotoxic activity, were concurrently recorded. A reduction in lipolytic activity was accompanied by a decrease in cytotoxicity on Caco2 cells. These data support the idea that the lipolytic activity associated with ricin is relevant to a lipase whose activity is pH and galactose dependent, sensitive to diethyl p-nitrophenylphosphate, and that a lipolytic step may be involved in the process of cell poisoning by ricin. Both colorimetric tests used in this study are sensitive enough to be helpful in the detection of possible lipolytic activities associated with other cytotoxins or lectins.</div>
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<Title>The Biochemical journal</Title>
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<ArticleTitle>Lipolytic activity of ricin from Ricinus sanguineus and Ricinus communis on neutral lipids.</ArticleTitle>
<Pagination><MedlinePgn>773-81</MedlinePgn>
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<Abstract><AbstractText>The present study was carried out with a view of determining ricin lipolytic activity on neutral lipids in emulsion and in a membrane-like model. Using 2,3-dimercapto-1-propanol tributyrate (BAL-TC(4)) as substrate, the lipolytic activity of ricin was found to be proportional to ricin and substrate concentrations, with an apparent K(m) (K(m,app)) of 2.4 mM, a k(cat) of 200 min(-1) and a specific activity of 1.0 unit/mg of protein. This work was extended to p-nitrophenyl (pNP) fatty acid esters containing two to twelve carbon atoms. Maximum lipolytic activity was registered on pNP decanoate (pNPC(10)), with a K(m,app) of 3.5 mM, a k(cat) of 173 min(-1) and a specific activity of 3.5 units/mg of protein. Ricin lipolytic activity is pH and galactose dependent, with a maximum at pH 7.0 in the presence of 0.2 M galactose. Using the monolayer technique with dicaprin as substrate, ricin showed a lipolytic activity proportional to the ricin concentration at 20 mN/m, which is dependent on the surface pressure of the lipid monolayer and is detectable up to 30 mN/m, a surface pressure that is of the same order of magnitude as that of natural cell membranes. The methods based on pNPC(10) and BAL-TC(4) hydrolysis are simple and reproducible; thus they can be used for routine studies of ricin lipolytic activity. Ricin from Ricinus communis and R. sanguineus were treated with diethyl p-nitrophenylphosphate, an irreversible serine esterase inhibitor, and their lipolytic activities on BAL-TC(4) and pNPC(10), and cytotoxic activity, were concurrently recorded. A reduction in lipolytic activity was accompanied by a decrease in cytotoxicity on Caco2 cells. These data support the idea that the lipolytic activity associated with ricin is relevant to a lipase whose activity is pH and galactose dependent, sensitive to diethyl p-nitrophenylphosphate, and that a lipolytic step may be involved in the process of cell poisoning by ricin. Both colorimetric tests used in this study are sensitive enough to be helpful in the detection of possible lipolytic activities associated with other cytotoxins or lectins.</AbstractText>
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<QualifierName MajorTopicYN="N" UI="Q000031">analogs & derivatives</QualifierName>
<QualifierName MajorTopicYN="N" UI="Q000378">metabolism</QualifierName>
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<MeshHeading><DescriptorName MajorTopicYN="N" UI="D004952">Esters</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName MajorTopicYN="N" UI="D007700">Kinetics</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName MajorTopicYN="N" UI="D037102">Lectins</DescriptorName>
<QualifierName MajorTopicYN="N" UI="Q000737">chemistry</QualifierName>
<QualifierName MajorTopicYN="N" UI="Q000378">metabolism</QualifierName>
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<MeshHeading><DescriptorName MajorTopicYN="N" UI="D037121">Plant Lectins</DescriptorName>
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<MeshHeading><DescriptorName MajorTopicYN="Y" UI="D010947">Plants, Toxic</DescriptorName>
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<MeshHeading><DescriptorName MajorTopicYN="N" UI="D012276">Ricin</DescriptorName>
<QualifierName MajorTopicYN="Y" UI="Q000737">chemistry</QualifierName>
<QualifierName MajorTopicYN="Y" UI="Q000378">metabolism</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName MajorTopicYN="N" UI="D012278">Ricinus</DescriptorName>
<QualifierName MajorTopicYN="Y" UI="Q000378">metabolism</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName MajorTopicYN="N" UI="D016415">Sequence Alignment</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName MajorTopicYN="N" UI="D013379">Substrate Specificity</DescriptorName>
</MeshHeading>
</MeshHeadingList>
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