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

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The P4 metal binding site in RNase P RNA affects active site metal affinity through substrate positioning.

Although helix P4 in the catalytic domain of the RNase P ribozyme is known to coordinate magnesium ions important for activity, distinguishing between direct and indirect roles in catalysis has been difficult. Here, we provide evidence for an indirect role in catalysis by showing that while the universally conserved bulge of helix P4 is positioned 5 nt downstream of the cleavage site, changes in its structure can still purturb active site metal binding. Because changes in helix P4 also appear to alter its position relative to the pre-tRNA cleavage site, these data suggest that P4 contributes to catalytic metal ion binding through substrate positioning.[1]

References

  1. The P4 metal binding site in RNase P RNA affects active site metal affinity through substrate positioning. Christian, E.L., Smith, K.M., Perera, N., Harris, M.E. RNA (2006) [Pubmed]
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