Porphyrin biosynthesis in rhodopseudomonas palustris-V. Purification of porphyrinogen decarboxylase and some unusual properties

Autores
Koopmann, G.E.; Juknat de Geralnik, A.A.; del C. Batlle, A.M.
Año de publicación
1986
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
1. 1. Uroporphyrinogen decarboxylase (EC 4.1.1.37) has been purified 16-fold from Rp. palustris to a specific activity of 210 nmol of total decarboxylated porphyrinogens III formed/hr per mg of protein and about 50% yield. The Rp. palustris enzyme exhibits some unusual properties as compared with URO-D from other sources. 2. 2. The purified enzyme is a monomer with a molecular weight of ∼46,000, an isoelectric point of 4.6 and an optimum pH of 6.9 and 6.8 with urogen III and I substrate. Neither GSH nor EDTA seem to be necessary for activity, and the decarboxylation rate and the distribution of the reaction products was not affected either by the presence or absence of oxygen. 3. 3. The Rp. palustris enzyme is a thermo-stable protein, heating at 60°C for 15 min enhanced several times activity. This is the first time that the heat treatment is included as one of the steps to purify URO-D. 4. 4. Thermal activation followed an identical profile using either substrate. The ratios of specific activity for the type III and I isomer of urogen remained constant throughout the purification. These findings are indicating that a single enzyme catalyzes the four decarboxylations occurring from urogen to coprogen. 5. 5. Kinetic data employing urogen III and I as substrate showed that the pattern of accumulated intermediates was rather different depending on whether type III or I isomer was used. 6. 6. While decarboxylation of urogen III responds to the usual scheme: {A figure is presented} where v1≫v2 and decarboxylation of heptagen III is the rate-controlling step. 7. 7. Decarboxylation of urogen I revealed a completely different and characteristic picture fitting the scheme: {A figure is presented} where again v′1≫v′2 and the removal of the final carboxyl group from pentagen I becomes the rate-limiting step. © 1986.
Fil:Juknat de Geralnik, A.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:del C. Batlle, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fuente
Int. J. Biochem. 1986;18(10):935-944
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/2.5/ar
Repositorio
Biblioteca Digital (UBA-FCEN)
Institución
Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
OAI Identificador
paperaa:paper_0020711X_v18_n10_p935_Koopmann

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oai_identifier_str paperaa:paper_0020711X_v18_n10_p935_Koopmann
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repository_id_str 1896
network_name_str Biblioteca Digital (UBA-FCEN)
spelling Porphyrin biosynthesis in rhodopseudomonas palustris-V. Purification of porphyrinogen decarboxylase and some unusual propertiesKoopmann, G.E.Juknat de Geralnik, A.A.del C. Batlle, A.M.1. 1. Uroporphyrinogen decarboxylase (EC 4.1.1.37) has been purified 16-fold from Rp. palustris to a specific activity of 210 nmol of total decarboxylated porphyrinogens III formed/hr per mg of protein and about 50% yield. The Rp. palustris enzyme exhibits some unusual properties as compared with URO-D from other sources. 2. 2. The purified enzyme is a monomer with a molecular weight of ∼46,000, an isoelectric point of 4.6 and an optimum pH of 6.9 and 6.8 with urogen III and I substrate. Neither GSH nor EDTA seem to be necessary for activity, and the decarboxylation rate and the distribution of the reaction products was not affected either by the presence or absence of oxygen. 3. 3. The Rp. palustris enzyme is a thermo-stable protein, heating at 60°C for 15 min enhanced several times activity. This is the first time that the heat treatment is included as one of the steps to purify URO-D. 4. 4. Thermal activation followed an identical profile using either substrate. The ratios of specific activity for the type III and I isomer of urogen remained constant throughout the purification. These findings are indicating that a single enzyme catalyzes the four decarboxylations occurring from urogen to coprogen. 5. 5. Kinetic data employing urogen III and I as substrate showed that the pattern of accumulated intermediates was rather different depending on whether type III or I isomer was used. 6. 6. While decarboxylation of urogen III responds to the usual scheme: {A figure is presented} where v1≫v2 and decarboxylation of heptagen III is the rate-controlling step. 7. 7. Decarboxylation of urogen I revealed a completely different and characteristic picture fitting the scheme: {A figure is presented} where again v′1≫v′2 and the removal of the final carboxyl group from pentagen I becomes the rate-limiting step. © 1986.Fil:Juknat de Geralnik, A.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:del C. Batlle, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.1986info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12110/paper_0020711X_v18_n10_p935_KoopmannInt. J. Biochem. 1986;18(10):935-944reponame:Biblioteca Digital (UBA-FCEN)instname:Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturalesinstacron:UBA-FCENenginfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/2.5/ar2025-09-29T13:43:03Zpaperaa:paper_0020711X_v18_n10_p935_KoopmannInstitucionalhttps://digital.bl.fcen.uba.ar/Universidad públicaNo correspondehttps://digital.bl.fcen.uba.ar/cgi-bin/oaiserver.cgiana@bl.fcen.uba.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:18962025-09-29 13:43:04.634Biblioteca Digital (UBA-FCEN) - Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturalesfalse
dc.title.none.fl_str_mv Porphyrin biosynthesis in rhodopseudomonas palustris-V. Purification of porphyrinogen decarboxylase and some unusual properties
title Porphyrin biosynthesis in rhodopseudomonas palustris-V. Purification of porphyrinogen decarboxylase and some unusual properties
spellingShingle Porphyrin biosynthesis in rhodopseudomonas palustris-V. Purification of porphyrinogen decarboxylase and some unusual properties
Koopmann, G.E.
title_short Porphyrin biosynthesis in rhodopseudomonas palustris-V. Purification of porphyrinogen decarboxylase and some unusual properties
title_full Porphyrin biosynthesis in rhodopseudomonas palustris-V. Purification of porphyrinogen decarboxylase and some unusual properties
title_fullStr Porphyrin biosynthesis in rhodopseudomonas palustris-V. Purification of porphyrinogen decarboxylase and some unusual properties
title_full_unstemmed Porphyrin biosynthesis in rhodopseudomonas palustris-V. Purification of porphyrinogen decarboxylase and some unusual properties
title_sort Porphyrin biosynthesis in rhodopseudomonas palustris-V. Purification of porphyrinogen decarboxylase and some unusual properties
dc.creator.none.fl_str_mv Koopmann, G.E.
Juknat de Geralnik, A.A.
del C. Batlle, A.M.
author Koopmann, G.E.
author_facet Koopmann, G.E.
Juknat de Geralnik, A.A.
del C. Batlle, A.M.
author_role author
author2 Juknat de Geralnik, A.A.
del C. Batlle, A.M.
author2_role author
author
dc.description.none.fl_txt_mv 1. 1. Uroporphyrinogen decarboxylase (EC 4.1.1.37) has been purified 16-fold from Rp. palustris to a specific activity of 210 nmol of total decarboxylated porphyrinogens III formed/hr per mg of protein and about 50% yield. The Rp. palustris enzyme exhibits some unusual properties as compared with URO-D from other sources. 2. 2. The purified enzyme is a monomer with a molecular weight of ∼46,000, an isoelectric point of 4.6 and an optimum pH of 6.9 and 6.8 with urogen III and I substrate. Neither GSH nor EDTA seem to be necessary for activity, and the decarboxylation rate and the distribution of the reaction products was not affected either by the presence or absence of oxygen. 3. 3. The Rp. palustris enzyme is a thermo-stable protein, heating at 60°C for 15 min enhanced several times activity. This is the first time that the heat treatment is included as one of the steps to purify URO-D. 4. 4. Thermal activation followed an identical profile using either substrate. The ratios of specific activity for the type III and I isomer of urogen remained constant throughout the purification. These findings are indicating that a single enzyme catalyzes the four decarboxylations occurring from urogen to coprogen. 5. 5. Kinetic data employing urogen III and I as substrate showed that the pattern of accumulated intermediates was rather different depending on whether type III or I isomer was used. 6. 6. While decarboxylation of urogen III responds to the usual scheme: {A figure is presented} where v1≫v2 and decarboxylation of heptagen III is the rate-controlling step. 7. 7. Decarboxylation of urogen I revealed a completely different and characteristic picture fitting the scheme: {A figure is presented} where again v′1≫v′2 and the removal of the final carboxyl group from pentagen I becomes the rate-limiting step. © 1986.
Fil:Juknat de Geralnik, A.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:del C. Batlle, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
description 1. 1. Uroporphyrinogen decarboxylase (EC 4.1.1.37) has been purified 16-fold from Rp. palustris to a specific activity of 210 nmol of total decarboxylated porphyrinogens III formed/hr per mg of protein and about 50% yield. The Rp. palustris enzyme exhibits some unusual properties as compared with URO-D from other sources. 2. 2. The purified enzyme is a monomer with a molecular weight of ∼46,000, an isoelectric point of 4.6 and an optimum pH of 6.9 and 6.8 with urogen III and I substrate. Neither GSH nor EDTA seem to be necessary for activity, and the decarboxylation rate and the distribution of the reaction products was not affected either by the presence or absence of oxygen. 3. 3. The Rp. palustris enzyme is a thermo-stable protein, heating at 60°C for 15 min enhanced several times activity. This is the first time that the heat treatment is included as one of the steps to purify URO-D. 4. 4. Thermal activation followed an identical profile using either substrate. The ratios of specific activity for the type III and I isomer of urogen remained constant throughout the purification. These findings are indicating that a single enzyme catalyzes the four decarboxylations occurring from urogen to coprogen. 5. 5. Kinetic data employing urogen III and I as substrate showed that the pattern of accumulated intermediates was rather different depending on whether type III or I isomer was used. 6. 6. While decarboxylation of urogen III responds to the usual scheme: {A figure is presented} where v1≫v2 and decarboxylation of heptagen III is the rate-controlling step. 7. 7. Decarboxylation of urogen I revealed a completely different and characteristic picture fitting the scheme: {A figure is presented} where again v′1≫v′2 and the removal of the final carboxyl group from pentagen I becomes the rate-limiting step. © 1986.
publishDate 1986
dc.date.none.fl_str_mv 1986
dc.type.none.fl_str_mv info:eu-repo/semantics/article
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dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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dc.source.none.fl_str_mv Int. J. Biochem. 1986;18(10):935-944
reponame:Biblioteca Digital (UBA-FCEN)
instname:Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron:UBA-FCEN
reponame_str Biblioteca Digital (UBA-FCEN)
collection Biblioteca Digital (UBA-FCEN)
instname_str Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron_str UBA-FCEN
institution UBA-FCEN
repository.name.fl_str_mv Biblioteca Digital (UBA-FCEN) - Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
repository.mail.fl_str_mv ana@bl.fcen.uba.ar
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