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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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TOR kinase domains are required for two distinct functions, only one of which is inhibited by rapamycin.

The rapamycin-sensitive signaling pathway is required to transduce specific mitogenic signals to the cell cycle machinery responsible for G1 progression. Genetic studies in yeast identified two related genes on this pathway, TOR1 and TOR2, thought to encode novel phosphatidylinositol kinases. We now show that an intact kinase domain is required for the G1 cell cycle functions of both proteins, for the ability of a mutation in a neighboring FKBP12-rapamycin-binding domain of the TOR1 protein to inhibit the growth of yeast cells when overexpressed, and for the essential function of the TOR2 protein. The G1 function of both TOR proteins is sensitive to rapamycin, but the essential function of TOR2 is not. Thus, FKBP12-rapamycin does not appear to inhibit the kinase activity of TOR proteins in a general way; instead, it may interfere selectively with TOR protein binding to or phosphorylation of G1 effectors.[1]

References

  1. TOR kinase domains are required for two distinct functions, only one of which is inhibited by rapamycin. Zheng, X.F., Florentino, D., Chen, J., Crabtree, G.R., Schreiber, S.L. Cell (1995) [Pubmed]
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