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Abstract:

The cAMP signal transduction pathway controls many processes in fungi. The Mucor circinelloides pkaR and pkaC genes, encoding the regulatory (PKAR) and catalytic (PKAC) subunit of the cAMP-dependent protein kinase A (PKA), have been cloned recently. Expression analysis during the dimorphic shift and colony morphology suggested a role for PKAR in the control of morphology and branching. Here strain KFA121, which overexpresses the M. circinelloides pkaR gene, was used to quantify growth and branching under different aerobic growth conditions in a flow-through cell by computerized image analysis. An inverse relationship between the pkaR expression level in KFA121 and the hyphal growth unit length was observed in KFA121, suggesting a central role for PKAR in branching. A biochemical analysis of PKAR using antibodies and enzyme assay demonstrated that the level of PKAR is higher in KFA121 under inducing conditions, i.e. in the presence of high glucose, than in the vector control strain KFA89. Measurement of cAMP binding demonstrated a significant increase (two- to threefold) in PKAR level for KFA121 at the time of germ-tube emission in medium containing 10 g glucose l-1. The level of PKA activity was determined using kemptide in the same crude cell extracts used to determine cAMP binding. Strain KFA121 showed a twofold increase in PKA activity. An excess of free PKAR subunit over PKA holoenzyme was determined using sucrose gradient centrifugation of extracts from KFA89 and KFA121. The data indicate that cAMP-dependent PKA in M. circinelloides might be down-regulated during hyphal-tube emergence and that an increase in PKAR levels results in increased branching.

Registro:

Documento: Artículo
Título:Protein kinase A is involved in the control of morphology and branching during aerobic growth of Mucor circinelloides
Autor:Lübbehüsen, T.; González Polo, V.; Rossi, S.; Nielsen, J.; Moreno, S.; McIntyre, M.; Arnau, J.
Filiación:Center for Process Biotechnology, Technical University of Denmark, Building 223, DK-2800 Lyngby, Denmark
Departamento de Quimica Biologica, Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellon 2 - Piso 4, 1428 Buenos Aires, Argentina
Department of Fungal Biotechnology, Biotechnological Institute, Kogle Allé 2, DK-2970 Hørsholm, Denmark
Palabras clave:antibody; cyclic AMP dependent protein kinase; glucose; holoenzyme; kemptide; protein subunit; regulator protein; sucrose; aerobic capacity; article; branching morphogenesis; centrifugation; computer analysis; controlled study; culture medium; down regulation; enzyme assay; fungal morphology; fungal strain; fungus culture; fungus growth; gene overexpression; image analysis; molecular cloning; Mucor; mucor circinelloides; nonhuman; nucleotide sequence; organism colony; priority journal; protein analysis; protein binding; protein expression; protein function; signal transduction; species difference; vector control; Fungi; Mucor circinelloides; Mucor circinelloides; Trixis
Año:2004
Volumen:150
Número:1
Página de inicio:143
Página de fin:150
DOI: http://dx.doi.org/10.1099/mic.0.26708-0
Título revista:Microbiology
Título revista abreviado:Microbiology
ISSN:13500872
CODEN:MROBE
CAS:cyclic AMP dependent protein kinase; glucose, 50-99-7, 84778-64-3; kemptide, 65189-71-1; sucrose, 122880-25-5, 57-50-1
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13500872_v150_n1_p143_Lubbehusen

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Citas:

---------- APA ----------
Lübbehüsen, T., González Polo, V., Rossi, S., Nielsen, J., Moreno, S., McIntyre, M. & Arnau, J. (2004) . Protein kinase A is involved in the control of morphology and branching during aerobic growth of Mucor circinelloides. Microbiology, 150(1), 143-150.
http://dx.doi.org/10.1099/mic.0.26708-0
---------- CHICAGO ----------
Lübbehüsen, T., González Polo, V., Rossi, S., Nielsen, J., Moreno, S., McIntyre, M., et al. "Protein kinase A is involved in the control of morphology and branching during aerobic growth of Mucor circinelloides" . Microbiology 150, no. 1 (2004) : 143-150.
http://dx.doi.org/10.1099/mic.0.26708-0
---------- MLA ----------
Lübbehüsen, T., González Polo, V., Rossi, S., Nielsen, J., Moreno, S., McIntyre, M., et al. "Protein kinase A is involved in the control of morphology and branching during aerobic growth of Mucor circinelloides" . Microbiology, vol. 150, no. 1, 2004, pp. 143-150.
http://dx.doi.org/10.1099/mic.0.26708-0
---------- VANCOUVER ----------
Lübbehüsen, T., González Polo, V., Rossi, S., Nielsen, J., Moreno, S., McIntyre, M., et al. Protein kinase A is involved in the control of morphology and branching during aerobic growth of Mucor circinelloides. Microbiology. 2004;150(1):143-150.
http://dx.doi.org/10.1099/mic.0.26708-0