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A stochastic model of the pathway has been reported.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>We have created deterministic mathematical models of the PKA module of the pathway, as well as the complete cAMP pathway. First, a simplified conceptual model was created which reproduced the dynamics of changes in cAMP levels in response to glucose addition in wild-type as well as cAMP phosphodiesterase deletion mutants. This model was used to investigate the role of the regulatory Krh proteins that had not been included previously. The Krh-containing conceptual model reproduced very well the experimental evidence supporting the role of Krh as a direct inhibitor of PKA. These results were used to develop the Complete cAMP Model. Upon simulation it illustrated several important features of the yeast cAMP pathway: Pde1p is more important than is Pde2p for controlling the cAMP levels following glucose pulses; the proportion of active PKA is not directly proportional to the cAMP level, allowing PKA to exert negative feedback; negative feedback mechanisms include activating Pde1p and deactivating Ras2 via phosphorylation of Cdc25. The Complete cAMP model is easier to simulate, and although significantly simpler than the existing stochastic one, it recreates cAMP levels and patterns of changes in cAMP levels observed experimentally <jats:italic>in vivo<\/jats:italic> in response to glucose addition in wild-type as well as representative mutant strains such as <jats:italic>pde1\u0394, pde2\u0394<\/jats:italic>, <jats:italic>cyr1\u0394<\/jats:italic>, and others. The complete model is made available in SBML format.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>We suggest that the lower number of reactions and parameters makes these models suitable for integrating them with models of metabolism or of the cell cycle in <jats:italic>S. cerevisiae<\/jats:italic>. Similar models could be also useful for studies in the human pathogen <jats:italic>Candida albicans<\/jats:italic> as well as other less well-characterized fungal species.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1752-0509-3-70","type":"journal-article","created":{"date-parts":[[2009,7,16]],"date-time":"2009-07-16T18:21:45Z","timestamp":1247768505000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Deterministic mathematical models of the cAMP pathway in Saccharomyces cerevisiae"],"prefix":"10.1186","volume":"3","author":[{"given":"Thomas","family":"Williamson","sequence":"first","affiliation":[]},{"given":"Jean-Marc","family":"Schwartz","sequence":"additional","affiliation":[]},{"given":"Douglas B","family":"Kell","sequence":"additional","affiliation":[]},{"given":"Lubomira","family":"Stateva","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2009,7,16]]},"reference":[{"key":"338_CR1","doi-asserted-by":"publisher","first-page":"30477","DOI":"10.1074\/jbc.M201094200","volume":"277","author":"P Portela","year":"2002","unstructured":"Portela P, Howell S, Moreno S, Rossi S: In vivo and in vitro phosphorylation of two isoforms of yeast pyruvate kinase by protein kinase A. 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