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Letter
Research Support, Non-U.S. Gov't
New interactions between tumor suppressor Fhit protein and a nonhydrolyzable analog of its A P 4 A substrate.
FEBS Letters 2017 Februrary
Fragile histidine triad protein (Fhit) is a protein which primarily hydrolyses dinucleoside polyphosphates. To investigate possible interactions between the protein and a substrate, we used a nonhydrolyzable phosphorothioate analog of Ap4 A, containing 5-bromo-2'-deoxyuridine instead of one adenosine residue. Photocrosslinking, followed by LC-MS experiments, determined a complex in which the probe was covalently linked to the NDSIYEELQK peptide (residues 110-119). The peptide was located within the 'disordered' region, which is invisible in the known crystal structures of Fhit. This invisible and flexible part seems to play a role in the stabilization of the Fhit-substrate complex, which may be important for its tumor suppressor activity.
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