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Poly(A) polymerase binds specifically to ATP and adds it the end of a mRNA chain. This structure contains an oligo(A) polynucleotide with 5 nucleotides, an ATP molecule, and a magnesium ion. … In the , the enzyme is shown as a blue backbone, the RNA chain in yellow, the ATP in red, the Mg⁺⁺ in green, and ALA154 in magenta. Several mechanisms are used to achieve the specificity for ATP. The Mg⁺⁺ is coordinated by , and the Mg⁺⁺ coordinates with the phosphates of ATP, positioning the nucleotide in the active site. The adenine base is sandwiched between the . Read more...

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Proteopedia - a scientific 'wiki' bridging the rift between 3D structure and function of biomacromolecules, Genome Biology 2008, 9:R121 doi:10.1186/gb-2008-9-8-r121