Mostrar el registro sencillo del ítem
dc.contributor.author
Nusblat, Alejandro David
dc.contributor.author
Muñoz, Luciana
dc.contributor.author
Valcarce, German A.
dc.contributor.author
Nudel, Berta Clara
dc.date.available
2024-08-06T10:59:05Z
dc.date.issued
2005-01
dc.identifier.citation
Nusblat, Alejandro David; Muñoz, Luciana; Valcarce, German A.; Nudel, Berta Clara; Characterisation and properties of cholesterol desaturases from the ciliate Tetrahymena thermophila; Wiley Blackwell Publishing, Inc; Journal of Eukaryotic Microbiology; 52; 1; 1-2005; 61-67
dc.identifier.issn
1066-5234
dc.identifier.uri
http://hdl.handle.net/11336/241794
dc.description.abstract
Live Tetrahymena thermophila transforms exogenous cholesterol into 7,22-bis, dehydrocholesterol (DHC) by desaturation at positions C7(8) and C22(23) of the cholesterol moiety. In this first report on expression, isolation, characterization, and reconstitution of at positions C7(8) and C22(23) of the cholesterol moiety. In this first report on expression, isolation, characterization, and reconstitution of Tetrahymena thermophila transforms exogenous cholesterol into 7,22-bis, dehydrocholesterol (DHC) by desaturation at positions C7(8) and C22(23) of the cholesterol moiety. In this first report on expression, isolation, characterization, and reconstitution of Tetrahymena’s cholesterol desaturases in cell-free extracts, we describe conditions for increasing the expression of both desaturases based on the addition of specific sterols to the culture medium. Reactions performed in vitro, with isolated microsomes, yield only the monounsaturated derivatives, 7-DHC and/or 22-DHC. However, selectivity towards one product can be improved with the addition of specific compounds: b-mercaptoethanol inhibited C22(23) desaturase activity completely, while ethanol selectively increased this activity. Detergent- solubilized microsomes showed no desaturase activity, but partial restoration could be achieved with addition of dilauroylphosphatidylcholine liposomes (25%). Both cholesterol desaturases require molecular oxygen and cytochrome b5. NADH Q1 or NADPH can serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. solubilized microsomes showed no desaturase activity, but partial restoration could be achieved with addition of dilauroylphosphatidylcholine liposomes (25%). Both cholesterol desaturases require molecular oxygen and cytochrome b5. NADH Q1 or NADPH can serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. on the addition of specific sterols to the culture medium. Reactions performed in vitro, with isolated microsomes, yield only the monounsaturated derivatives, 7-DHC and/or 22-DHC. However, selectivity towards one product can be improved with the addition of specific compounds: b-mercaptoethanol inhibited C22(23) desaturase activity completely, while ethanol selectively increased this activity. Detergent- solubilized microsomes showed no desaturase activity, but partial restoration could be achieved with addition of dilauroylphosphatidylcholine liposomes (25%). Both cholesterol desaturases require molecular oxygen and cytochrome b5. NADH Q1 or NADPH can serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. solubilized microsomes showed no desaturase activity, but partial restoration could be achieved with addition of dilauroylphosphatidylcholine liposomes (25%). Both cholesterol desaturases require molecular oxygen and cytochrome b5. NADH Q1 or NADPH can serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. s cholesterol desaturases in cell-free extracts, we describe conditions for increasing the expression of both desaturases based on the addition of specific sterols to the culture medium. Reactions performed in vitro, with isolated microsomes, yield only the monounsaturated derivatives, 7-DHC and/or 22-DHC. However, selectivity towards one product can be improved with the addition of specific compounds: b-mercaptoethanol inhibited C22(23) desaturase activity completely, while ethanol selectively increased this activity. Detergent- solubilized microsomes showed no desaturase activity, but partial restoration could be achieved with addition of dilauroylphosphatidylcholine liposomes (25%). Both cholesterol desaturases require molecular oxygen and cytochrome b5. NADH Q1 or NADPH can serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. solubilized microsomes showed no desaturase activity, but partial restoration could be achieved with addition of dilauroylphosphatidylcholine liposomes (25%). Both cholesterol desaturases require molecular oxygen and cytochrome b5. NADH Q1 or NADPH can serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. b-mercaptoethanol inhibited C22(23) desaturase activity completely, while ethanol selectively increased this activity. Detergent- solubilized microsomes showed no desaturase activity, but partial restoration could be achieved with addition of dilauroylphosphatidylcholine liposomes (25%). Both cholesterol desaturases require molecular oxygen and cytochrome b5. NADH Q1 or NADPH can serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions. b5. NADH Q1 or NADPH can serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions.b5 in these reactions.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
C22(23)-cholesterol desaturase, C7(8)-cholesterol desaturase
dc.subject
inhibitors
dc.subject
induction by sterols
dc.subject
reconstitution in vesicles
dc.subject.classification
Biología Celular, Microbiología
dc.subject.classification
Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Characterisation and properties of cholesterol desaturases from the ciliate Tetrahymena thermophila
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-08-05T13:54:04Z
dc.journal.volume
52
dc.journal.number
1
dc.journal.pagination
61-67
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Nusblat, Alejandro David. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Microbiología, Inmunología y Biotecnología. Cátedra de Microbiología Industrial y Biotecnología; Argentina
dc.description.fil
Fil: Muñoz, Luciana. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Microbiología, Inmunología y Biotecnología. Cátedra de Microbiología Industrial y Biotecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Valcarce, German A.. No especifíca;
dc.description.fil
Fil: Nudel, Berta Clara. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Microbiología, Inmunología y Biotecnología. Cátedra de Microbiología Industrial y Biotecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Journal of Eukaryotic Microbiology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/full/10.1111/j.1550-7408.2005.3279rr.x
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/j.1550-7408.2005.3279rr.x
Archivos asociados