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Group transfer reaction
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=== Protein Adenylylation === Group transfer reactions are prevalent in many biological mechanisms.<ref name=":1" /> One example is protein [[adenylylation]], where [[adenosine triphosphate]] (ATP) transfers an adenosine monophosphate group to another protein at threonine or tyrosine residues. Adenylylation protein modification adds a negative charge to the protein and thus changes its protein function.<ref name=":2" /> Protein adenylylation is especially documented in bacterial modification of GTPases, since this modification of GTPases via adenylylation prevents the host cellβs ability to prevent infection.<ref name=":1" /><ref name=":2" /> [[File:Protein_adenylylation.png|none|thumb|650x650px|''Figure 4''. Scheme of protein adenylylation of threonine and tyrosine side chains, a biological application of group transfer reactions. This figure is adapted from Hedberg and Itzen.<ref name=":2" />]]
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