A steady-state modeling approach to validate an in vivo mechanism of the GAL regulatory network in Saccharomyces cerevisiae.
Cellular regulation is a result of complex interactions arising from DNA-protein and protein-protein binding, autoregulation, and compartmentalization and shuttling of regulatory proteins. Experiments in molecular biology have identified these mechanisms recruited by a regulatory network. Mathematical models may be used to complement the knowledge-base provided by in vitro experimental methods. Interactions identified by in vitro experiments can lead to the hypothesis of multiple candidate models explaining the in vivo mechanism. The equilibrium dissociation constants for the various interactions and the total component concentration constitute constraints on the candidate models. In this work, we identify the most plausible in vivo network by comparing the output response to the experimental data. We demonstrate the methodology using the GAL system of Saccharomyces cerevisiae for which the steady-state analysis reveals that Gal3p neither dimerizes nor shuttles between the cytoplasm and the nucleus.
Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, India.
Malkhey
M
Verma
Paike J
PJ
Bhat
Sharad
S
Bhartiya
K V
KV
Venkatesh
D001665:Binding Sites; D002467:Cell Nucleus / Q000378:metabolism; D003198:Computer Simulation; D003593:Cytoplasm / Q000378:metabolism; D005690:Galactose / Q000378:metabolism* / Q000494:pharmacology; D015870:Gene Expression; D005800:Genes, Fungal; D007700:Kinetics; D008954:Models, Biological; D012441:Saccharomyces cerevisiae / Q000201:enzymology / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D000520:alpha-Glucosidases / Q000235:genetics / Q000378:metabolism; D001616:beta-Galactosidase / Q000235:genetics / Q000378:metabolism
D029701:Saccharomyces cerevisiae Proteins; D000520:alpha-Glucosidases; D001616:beta-Galactosidase; D005690:Galactose