Superparamagnetic Fe3O4 nanoparticles (NPs) are engineered to reversibly self-assemble in response to antagonistic enzyme inputs. Tyrosine kinase activity directs substrate-NPs and SH2 domain-NPs to coalesce via polyvalent SH2-phosphopeptide binding. Phosphatase antagonizes this process and directs NP dispersion. By coupling assembly to substrate phosphorylation, the kinase activity is imaged via quantitative T2 relaxation changes in MRI.
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Maltzahn et al. (2007) studied this question.
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