The addition of an alpha-borano or alpha-H group to PMEA and PMPA impairs their phosphorylation by human AMP kinases 1 and 2, likely due to disruption of critical arginine interactions.
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These modifications may hinder PMEA/PMPA activation in humans; leaves open optimal designs for kinase-dependent nucleotide analogs.
Topalis et al. (2008) studied this question.
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