By Eric S. Lander, Michael S. Waterman
During this first-ever survey of the partnership among arithmetic and biology, best specialists examine how mathematical learn and strategies have made attainable very important discoveries in biology. Explores how differential geometry, topology, and differential mechanics have allowed researchers to "wind" and "unwind" DNA's double helix to appreciate the phenomenon of supercoiling. Explains how mathematical instruments are revealing the workings of enzymes and proteins. Describes how mathematicians are detecting echoes from the beginning of lifestyles via utilizing the stochastic and statictical idea to the research of DNA sequences.
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Extra info for Calculating the Secrets of Life: Applications of the Mathematical Sciences in Molecular Biology
14 cAMP signal transduction in slime mould The Dictyostelium genome is now fully sequenced and although the genes for the components of the chemotaxis/differentiation pathways are known, few of the gene products’ activities have been biochemically characterised. Dictyostelium has six chromosomes with an estimated 12,500 genes. 1) and the unrelated family of cAMP receptors (cAR1, cAR2, cAR3 and cAR4) and cAMP receptor-like GPCRs (CRLs) that are unique to slime moulds39. The genome contains 14 heterotrimeric G protein alpha subunits, but only two Gb and a single Gg gene are present40.
B82 plasma membranes were dissolved in detergent then mildly heat-treated (37 C, 30 minutes) to destroy AC activity. When the heat-inactivated membrane extracts were incubated with cycÀ membranes, activation in response to both adrenergic agonist and fluoride cells was restored. Whatever the restorative factor was, it could not be adenylyl cyclase, and it was obviously not b-adrenergic receptor. As it transpired, the heat-resistant factor was the alpha subunit (Gas) of the stimulatory G protein Gs, which is the only component of the AC system missing from cycÀ cells (it had first been thought that AC was absent).
Perhaps the most significant happenstance was that Earl Sutherland’s laboratory used dogs, rather than rats, as a source of tissues. This was fortunate because his experiments might not have worked otherwise, but unfortunate because most other labs used liver from young male rats. Their work was greatly simplified by the fact that cAMP is heat-stable. Their final piece of good luck was that the ATP they used was impure – it contained small amounts of GTP. Without this contaminant, their experiments would not have worked, for reasons that would not become clear for another 20 years.