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The human septin7 and the yeast CDC10 septin prevent Bax and copper mediated cell death in yeast.

Identifieur interne : 000F60 ( Main/Exploration ); précédent : 000F59; suivant : 000F61

The human septin7 and the yeast CDC10 septin prevent Bax and copper mediated cell death in yeast.

Auteurs : Avital Horowitz [Canada] ; Jason F. Lapointe [Canada] ; Rawan Eid [Canada] ; Sara Sheibani [Canada] ; Nada Gharib [Canada] ; Natalie K. Jones [Canada] ; Hojatollah Vali [Canada] ; Craig A. Mandato [Canada] ; Michael T. Greenwood [Canada]

Source :

RBID : pubmed:24055994

Descripteurs français

English descriptors

Abstract

The mechanisms of programmed cell death activate genetically encoded intracellular programs in a controlled manner, the most common form being apoptosis. Apoptosis is carried out through a cascade of caspase mediated proteolytic cleavages initiated by the oligomerization of Bax, a cardinal regulator of mitochondrial-mediated apoptosis. Heterologous expression of Bax in yeast causes cell death that shares a number of similarities to processes that occur in mammalian apoptosis. A screen of a cardiac cDNA library for suppressors of Bax-mediated apoptosis identified human septin7, a protein that belongs to the septin superfamily of conserved GTP-binding proteins that share a conserved cdc/septin domain. Analysis of the amino acid sequence deduced from the septin7 clone as well as the corresponding human septin7 gene revealed that a novel alternatively spliced transcript called septin7 variant4 (v4) was uncovered. Yeast cells overexpressing the human septin7 v4 cDNA were also capable of resisting copper-mediated cell death suggesting that it is not only a Bax suppressor but also an anti-apoptotic sequence. Analysis of septin7 function in a MCA1Δ yeast strain suggests that septin7 inhibits apoptosis in a caspase independent pathway. Overexpression of the yeast septin7 ortholog CDC10 also conferred resistance to the negative effects of copper as well as protecting cells from the overexpression of Bax. In contrast, septin7 was unable to prevent the increase in cell size associated with mutants lacking the endogenous yeast CDC10 gene. Taken together, our analysis suggests that anti-apoptosis is a novel yet evolutionarily conserved property of the septin7 sub-family of septins.

DOI: 10.1016/j.bbamcr.2013.09.004
PubMed: 24055994


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Le document en format XML

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<term>Base Sequence (MeSH)</term>
<term>Caspases (deficiency)</term>
<term>Caspases (metabolism)</term>
<term>Cell Cycle Proteins (chemistry)</term>
<term>Cell Cycle Proteins (metabolism)</term>
<term>Copper (toxicity)</term>
<term>Drug Resistance, Fungal (drug effects)</term>
<term>Exons (genetics)</term>
<term>GTP Phosphohydrolases (metabolism)</term>
<term>Humans (MeSH)</term>
<term>Introns (genetics)</term>
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<term>Saccharomyces cerevisiae (drug effects)</term>
<term>Saccharomyces cerevisiae (metabolism)</term>
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<term>Sirolimus (pharmacology)</term>
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<term>Caspases (métabolisme)</term>
<term>Cuivre (toxicité)</term>
<term>Données de séquences moléculaires (MeSH)</term>
<term>Exons (génétique)</term>
<term>Humains (MeSH)</term>
<term>Introns (génétique)</term>
<term>Isoformes de protéines (métabolisme)</term>
<term>Mutation (génétique)</term>
<term>Protéine Bax (métabolisme)</term>
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<term>Septines (métabolisme)</term>
<term>Sirolimus (pharmacologie)</term>
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<term>Séquence nucléotidique (MeSH)</term>
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<term>Épissage alternatif (génétique)</term>
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<term>Caspases</term>
<term>Cell Cycle Proteins</term>
<term>GTP Phosphohydrolases</term>
<term>Membrane Proteins</term>
<term>Protein Isoforms</term>
<term>Saccharomyces cerevisiae</term>
<term>Saccharomyces cerevisiae Proteins</term>
<term>Septins</term>
<term>bcl-2-Associated X Protein</term>
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<term>Caspases</term>
<term>Isoformes de protéines</term>
<term>Protéine Bax</term>
<term>Protéines de Saccharomyces cerevisiae</term>
<term>Protéines du cycle cellulaire</term>
<term>Protéines membranaires</term>
<term>Saccharomyces cerevisiae</term>
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<term>Molecular Sequence Data</term>
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<div type="abstract" xml:lang="en">The mechanisms of programmed cell death activate genetically encoded intracellular programs in a controlled manner, the most common form being apoptosis. Apoptosis is carried out through a cascade of caspase mediated proteolytic cleavages initiated by the oligomerization of Bax, a cardinal regulator of mitochondrial-mediated apoptosis. Heterologous expression of Bax in yeast causes cell death that shares a number of similarities to processes that occur in mammalian apoptosis. A screen of a cardiac cDNA library for suppressors of Bax-mediated apoptosis identified human septin7, a protein that belongs to the septin superfamily of conserved GTP-binding proteins that share a conserved cdc/septin domain. Analysis of the amino acid sequence deduced from the septin7 clone as well as the corresponding human septin7 gene revealed that a novel alternatively spliced transcript called septin7 variant4 (v4) was uncovered. Yeast cells overexpressing the human septin7 v4 cDNA were also capable of resisting copper-mediated cell death suggesting that it is not only a Bax suppressor but also an anti-apoptotic sequence. Analysis of septin7 function in a MCA1Δ yeast strain suggests that septin7 inhibits apoptosis in a caspase independent pathway. Overexpression of the yeast septin7 ortholog CDC10 also conferred resistance to the negative effects of copper as well as protecting cells from the overexpression of Bax. In contrast, septin7 was unable to prevent the increase in cell size associated with mutants lacking the endogenous yeast CDC10 gene. Taken together, our analysis suggests that anti-apoptosis is a novel yet evolutionarily conserved property of the septin7 sub-family of septins. </div>
</front>
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<AbstractText>The mechanisms of programmed cell death activate genetically encoded intracellular programs in a controlled manner, the most common form being apoptosis. Apoptosis is carried out through a cascade of caspase mediated proteolytic cleavages initiated by the oligomerization of Bax, a cardinal regulator of mitochondrial-mediated apoptosis. Heterologous expression of Bax in yeast causes cell death that shares a number of similarities to processes that occur in mammalian apoptosis. A screen of a cardiac cDNA library for suppressors of Bax-mediated apoptosis identified human septin7, a protein that belongs to the septin superfamily of conserved GTP-binding proteins that share a conserved cdc/septin domain. Analysis of the amino acid sequence deduced from the septin7 clone as well as the corresponding human septin7 gene revealed that a novel alternatively spliced transcript called septin7 variant4 (v4) was uncovered. Yeast cells overexpressing the human septin7 v4 cDNA were also capable of resisting copper-mediated cell death suggesting that it is not only a Bax suppressor but also an anti-apoptotic sequence. Analysis of septin7 function in a MCA1Δ yeast strain suggests that septin7 inhibits apoptosis in a caspase independent pathway. Overexpression of the yeast septin7 ortholog CDC10 also conferred resistance to the negative effects of copper as well as protecting cells from the overexpression of Bax. In contrast, septin7 was unable to prevent the increase in cell size associated with mutants lacking the endogenous yeast CDC10 gene. Taken together, our analysis suggests that anti-apoptosis is a novel yet evolutionarily conserved property of the septin7 sub-family of septins. </AbstractText>
<CopyrightInformation>© 2013.</CopyrightInformation>
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<Affiliation>Department of Chemistry and Chemical Engineering, Royal Military College, Kingston, Ontario, Canada. Electronic address: michael.greenwood@rmc.ca.</Affiliation>
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<Month>09</Month>
<Day>19</Day>
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<Country>Netherlands</Country>
<MedlineTA>Biochim Biophys Acta</MedlineTA>
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<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
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<MeshHeading>
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<Keyword MajorTopicYN="N">Anti-apoptosis</Keyword>
<Keyword MajorTopicYN="N">Anti-apoptotic</Keyword>
<Keyword MajorTopicYN="N">Apoptosis</Keyword>
<Keyword MajorTopicYN="N">Cell size</Keyword>
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<name sortKey="Gharib, Nada" sort="Gharib, Nada" uniqKey="Gharib N" first="Nada" last="Gharib">Nada Gharib</name>
<name sortKey="Greenwood, Michael T" sort="Greenwood, Michael T" uniqKey="Greenwood M" first="Michael T" last="Greenwood">Michael T. Greenwood</name>
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<name sortKey="Vali, Hojatollah" sort="Vali, Hojatollah" uniqKey="Vali H" first="Hojatollah" last="Vali">Hojatollah Vali</name>
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