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Background: The G protein p21 ras is a molecular switch in the signal transduction pathway for cellular growth and differentiation. Hydrolysis of tightly bound GTP alters the conformation of p21, terminating the signal. The coordination of the p21 residue Thr35 to Mg 2+ in its active site, which has been observed in the crystal structure of p21 in complex with a GTP-analog GMPPNP but...
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