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New Proposals for the Formalization of Membrane Proteins

By Ioan I. Ardelean, Daniela Besozzi and Centre Of Microbiology


Abstract. This paper presents three new proposals to take advantage, in the framework of P systems, from proteins acting in bacteria. One attempt aims to focus on the transport protein that act as a logic AND gate at the cell membrane. The multiplicity of type of transporters involved in maintaining osmotic pressure within physiological values, both at short and long term level are also presented, as an example of parallelism occurring in living cell. Finally, the change of enzyme activity by reversible aggregation could be important for P systems as a new rule to follow, and process to model. 1 The Regulation of G6P-dehydrogenase Glucose-6-phosphate dehydrogenase (G6PD) is an enzyme that catalyzes (that is, it significantly increases the speed of) the reaction that takes away two atoms of hydrogen (thus the name dehydrogenase) from the chemical glucose-6-phosphate. This reaction is one essential step in glucose metabolism, occurring in almost all cells able to metabolize glucose. The activity of G6PD is modulated in cyanobacteria [20, 24, 13] by reversible transition of the enzyme between distinct aggregation states, which differ in catalytic activity. Thi

Year: 2013
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