Influence of the A15 mutation on the conformational energy balance in Escherichia coli tRNATyr
作者： V. Leon , S. Altman , D.M. Crothers
DOI: 10.1016/0022-2836(77)90053-5
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摘要: Abstract The A15 mutation in Escherichia coli tRNA su3 Tyr produces a transfer RNA whose tertiary structure has either higher or lower t m than the wild type, depending on Mg 2+ concentration. enthalpy that stabilizes is greatly reduced by mutation, but there are large compensating entropy changes. At 37 °C decreases magnitude of free energy stabilizing for all concentrations. nucleotide modifications s 4 U, iA and G ∗ do not contribute detectably to stability. results can be interpreted terms pairing between C57 , form suggested unusual bonding G15 C48 found crystallographic studies yeast phe . observed disturbance conformational balance should defective function
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