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

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Evidence for binding of the ectodomain of amyloid precursor protein 695 and activated high molecular weight kininogen.

To identify ligands that bind to the N-terminal portion of human amyloid precursor protein (APP), we sought binding partners for a fragment of the ectodomain of human APP695 (sAPP(695)T). The probe bound to fragments of high molecular weight kininogen (HK) in rat cortical membrane preparations in vitro. Laser confocal microscopy indicated that APP and HK colocalize near cerebral blood vessels, in the neuropil, and in many neurons of rat brain. sAPP(695)T bound to human activated kininogen (HKa) (K(d)=0.3+/-0.1 nM), but not to inactivated or low molecular weight kininogen. Binding was specific for the light chain sequence of HKa. Biotinylated human HKa also bound to sAPP(695) (K(d)=0.3+/-0.5 nM). sAPP(695) and HKa form tight complexes in solution that can be coimmunoprecipitated. These results support the hypothesis that forms of APP and kininogen can interact in brain tissue. Considering the implications of APP in neurite outgrowth, the APP-HKa interaction could modulate neurogenesis.[1]

References

  1. Evidence for binding of the ectodomain of amyloid precursor protein 695 and activated high molecular weight kininogen. Das, A., Smalheiser, N.R., Markaryan, A., Kaplan, A. Biochim. Biophys. Acta (2002) [Pubmed]
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