Revised Enzyme Synthesis Rate Expression in Cybernetic Models of Bacteria I Growth Brian
نویسندگان
چکیده
A revised enzyme synthesis rate expression for cybernetic models of bacterial growth is presented. The rate expression, which is comprised of inducible and constitutive contributions, provides for a basal enzyme level that is necessary to predict certain types of commonly observed continuous culture transients. The response of a continuous culture to a step change in feed stream composition is simulated using both the old and new formulations, and the ramifications for the "matchinglaw" formulation are discussed.
منابع مشابه
Application of cybernetic models to metabolic engineering: investigation of storage pathways
A cybernetic model is proposed to examine generic features of storage pathways. This model is capable of describing synthesis of carbon and non-carbon storage polymers. The effect of environmental conditions is evaluated using storage polymer level as a fraction of total biomass as a gauge of pathway performance. The base wild-type pathway is then analyzed to determine the effect of genetic alt...
متن کاملMetabolic regulation in bacterial continuous cultures: II.
The transient behavior of a continuous culture of Klebsiella pneumoniae with mixed feed of glucose and xylose arising from step-up and step-down in dilution rates and from a feed-switching experiment is presented. he organism gradually switches from simultaneous utilization of the substrates at low growth rates to preferred utilization of the faster substrate (i.e, supporting a higher growth ra...
متن کاملMultiplicity and stability of steady states in continuous bioreactors: dissection of cybernetic models
Microbes in industrial bioreactors generally encounter nutrient media that contain a spectrum of components satisfying various nutritional requirements with individual substrates playing roles that may be viewed as substitutable, complementary or combinations of the two to varying extents. Consequently, the pattern of uptake of di1erent nutrients (Pavlou and Fredrickson, Biotechnol. Bioengng 34...
متن کاملHow fast - growing bacteria robustly tune their ribosome concentration to approximate growth rate maximisation In collaboration with :
Maximisation of growth rate is an important fitness strategy for bacteria. Bacteria can achieve this by expressing proteins at optimal concentrations. This is exemplified in Escherichia coli by the covariation of its ribosome protein-fraction with growth rate. It increases with growth rate and precisely matches the increased protein synthesis demand. These findings and others have led to the hy...
متن کاملRT-PCR MEDIATED CLONING OF HUMAN GROWTH HORMONE GENE AND I TS EXPRESSION IN E. coli
Human growth hormone (hGH) genomic sequence containing 5 exons and 4 introns was cloned in pcDNA-3 and the constructed plasmid was subsequently used for transfection ofNlli-3T3 cell line using lipofection technique. Expression of hGH in stably transfected cells was assayed using ELISA. Total RNA was extracted from transfected cells and hGH cDNA was amplified by RT-PCR using specific primers...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003