Protein kinase A regulatory subunit isoforms regulate growth and differentiation in Mucor circinelloides: Essential role of pkaR4

The protein kinase A (PKA) signaling pathway plays a role in regulating growth and differentiation in the dimorphic fungus Mucor circinelloides. PKA holoenzyme is comprised of two catalytic (C) and two regulatory (R) subunits. In M. circinelloides, four genes encode the PKAR1, PKAR2, PKAR3, and PKAR...

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Autores principales:	Ocampo, Josefina, Moreno de Colonna, Silvia, Rossi, Silvia Graciela
Publicado:	2012
Materias:	cyclic AMP dependent protein kinase fungal protein holoenzyme isoprotein article enzymology fungus spore gene deletion genetics growth, development and aging metabolism morphogenesis Mucor protein subunit signal transduction ubiquitination Cyclic AMP-Dependent Protein Kinases Fungal Proteins Gene Deletion Holoenzymes Morphogenesis Protein Isoforms Protein Subunits Signal Transduction Spores, Fungal Ubiquitination Fungi Mucor circinelloides
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15359778_v11_n8_p989_Ocampo http://hdl.handle.net/20.500.12110/paper_15359778_v11_n8_p989_Ocampo
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	paper:paper_15359778_v11_n8_p989_Ocampo2023-06-08T16:20:07Z Protein kinase A regulatory subunit isoforms regulate growth and differentiation in Mucor circinelloides: Essential role of pkaR4 Ocampo, Josefina Moreno de Colonna, Silvia Rossi, Silvia Graciela cyclic AMP dependent protein kinase fungal protein holoenzyme isoprotein article enzymology fungus spore gene deletion genetics growth, development and aging metabolism morphogenesis Mucor protein subunit signal transduction ubiquitination Cyclic AMP-Dependent Protein Kinases Fungal Proteins Gene Deletion Holoenzymes Morphogenesis Mucor Protein Isoforms Protein Subunits Signal Transduction Spores, Fungal Ubiquitination Fungi Mucor circinelloides The protein kinase A (PKA) signaling pathway plays a role in regulating growth and differentiation in the dimorphic fungus Mucor circinelloides. PKA holoenzyme is comprised of two catalytic (C) and two regulatory (R) subunits. In M. circinelloides, four genes encode the PKAR1, PKAR2, PKAR3, and PKAR4 isoforms of R subunits. We have constructed null mutants and demonstrate that each isoform has a different role in growth and differentiation. The most striking finding is that pkaR4 is an essential gene, because only heterokaryons were obtained in knockout experiments. Heterokaryons with low levels of wild-type nuclei showed an impediment in the emission of the germ tube, suggesting a pivotal role of this gene in germ tube emergence. The remaining null strains showed different alterations in germ tube emergence, sporulation, and volume of the mother cell. The pkaR2 null mutant showed an accelerated germ tube emission and was the only mutant that germinated under anaerobic conditions when glycine was used as a nitrogen source, suggesting that pkaR2 participates in germ tube emergence by repressing it. From the measurement of the mRNA and protein levels of each isoform in the wild-type and knockout strains, it can be concluded that the expression of each subunit has its own mechanism of differential regulation. The PKAR1 and PKAR2 isoforms are posttranslationally modified by ubiquitylation, suggesting another regulation point in the specificity of the signal transduction. The results indicate that each R isoform has a different role in M. circinelloides physiology, controlling the dimorphism and contributing to the specificity of cyclic AMP (cAMP)-PKA pathway. © 2012, American Society for Microbiology. All Rights Reserved. Fil:Ocampo, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Moreno, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rossi, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15359778_v11_n8_p989_Ocampo http://hdl.handle.net/20.500.12110/paper_15359778_v11_n8_p989_Ocampo
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	cyclic AMP dependent protein kinase fungal protein holoenzyme isoprotein article enzymology fungus spore gene deletion genetics growth, development and aging metabolism morphogenesis Mucor protein subunit signal transduction ubiquitination Cyclic AMP-Dependent Protein Kinases Fungal Proteins Gene Deletion Holoenzymes Morphogenesis Mucor Protein Isoforms Protein Subunits Signal Transduction Spores, Fungal Ubiquitination Fungi Mucor circinelloides
spellingShingle	cyclic AMP dependent protein kinase fungal protein holoenzyme isoprotein article enzymology fungus spore gene deletion genetics growth, development and aging metabolism morphogenesis Mucor protein subunit signal transduction ubiquitination Cyclic AMP-Dependent Protein Kinases Fungal Proteins Gene Deletion Holoenzymes Morphogenesis Mucor Protein Isoforms Protein Subunits Signal Transduction Spores, Fungal Ubiquitination Fungi Mucor circinelloides Ocampo, Josefina Moreno de Colonna, Silvia Rossi, Silvia Graciela Protein kinase A regulatory subunit isoforms regulate growth and differentiation in Mucor circinelloides: Essential role of pkaR4
topic_facet	cyclic AMP dependent protein kinase fungal protein holoenzyme isoprotein article enzymology fungus spore gene deletion genetics growth, development and aging metabolism morphogenesis Mucor protein subunit signal transduction ubiquitination Cyclic AMP-Dependent Protein Kinases Fungal Proteins Gene Deletion Holoenzymes Morphogenesis Mucor Protein Isoforms Protein Subunits Signal Transduction Spores, Fungal Ubiquitination Fungi Mucor circinelloides
description	The protein kinase A (PKA) signaling pathway plays a role in regulating growth and differentiation in the dimorphic fungus Mucor circinelloides. PKA holoenzyme is comprised of two catalytic (C) and two regulatory (R) subunits. In M. circinelloides, four genes encode the PKAR1, PKAR2, PKAR3, and PKAR4 isoforms of R subunits. We have constructed null mutants and demonstrate that each isoform has a different role in growth and differentiation. The most striking finding is that pkaR4 is an essential gene, because only heterokaryons were obtained in knockout experiments. Heterokaryons with low levels of wild-type nuclei showed an impediment in the emission of the germ tube, suggesting a pivotal role of this gene in germ tube emergence. The remaining null strains showed different alterations in germ tube emergence, sporulation, and volume of the mother cell. The pkaR2 null mutant showed an accelerated germ tube emission and was the only mutant that germinated under anaerobic conditions when glycine was used as a nitrogen source, suggesting that pkaR2 participates in germ tube emergence by repressing it. From the measurement of the mRNA and protein levels of each isoform in the wild-type and knockout strains, it can be concluded that the expression of each subunit has its own mechanism of differential regulation. The PKAR1 and PKAR2 isoforms are posttranslationally modified by ubiquitylation, suggesting another regulation point in the specificity of the signal transduction. The results indicate that each R isoform has a different role in M. circinelloides physiology, controlling the dimorphism and contributing to the specificity of cyclic AMP (cAMP)-PKA pathway. © 2012, American Society for Microbiology. All Rights Reserved.
author	Ocampo, Josefina Moreno de Colonna, Silvia Rossi, Silvia Graciela
author_facet	Ocampo, Josefina Moreno de Colonna, Silvia Rossi, Silvia Graciela
author_sort	Ocampo, Josefina
title	Protein kinase A regulatory subunit isoforms regulate growth and differentiation in Mucor circinelloides: Essential role of pkaR4
title_short	Protein kinase A regulatory subunit isoforms regulate growth and differentiation in Mucor circinelloides: Essential role of pkaR4
title_full	Protein kinase A regulatory subunit isoforms regulate growth and differentiation in Mucor circinelloides: Essential role of pkaR4
title_fullStr	Protein kinase A regulatory subunit isoforms regulate growth and differentiation in Mucor circinelloides: Essential role of pkaR4
title_full_unstemmed	Protein kinase A regulatory subunit isoforms regulate growth and differentiation in Mucor circinelloides: Essential role of pkaR4
title_sort	protein kinase a regulatory subunit isoforms regulate growth and differentiation in mucor circinelloides: essential role of pkar4
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15359778_v11_n8_p989_Ocampo http://hdl.handle.net/20.500.12110/paper_15359778_v11_n8_p989_Ocampo
work_keys_str_mv	AT ocampojosefina proteinkinasearegulatorysubunitisoformsregulategrowthanddifferentiationinmucorcircinelloidesessentialroleofpkar4 AT morenodecolonnasilvia proteinkinasearegulatorysubunitisoformsregulategrowthanddifferentiationinmucorcircinelloidesessentialroleofpkar4 AT rossisilviagraciela proteinkinasearegulatorysubunitisoformsregulategrowthanddifferentiationinmucorcircinelloidesessentialroleofpkar4
_version_	1768543625759686656

Protein kinase A regulatory subunit isoforms regulate growth and differentiation in Mucor circinelloides: Essential role of pkaR4

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