Selective photoinactivation of protein function through environment-sensitive switching of singlet oxygen generation by photosensitizer.

Abstract:

:Chromophore-assisted light inactivation is a promising technique to inactivate selected proteins with high spatial and temporal resolution in living cells, but its use has been limited because of the lack of a methodology to prevent nonspecific photodamage in the cell owing to reactive oxygen species generated by the photosensitizer. Here we present a design strategy for photosensitizers with an environment-sensitive off/on switch for singlet oxygen ((1)O(2)) generation, which is switched on by binding to the target, to improve the specificity of protein photoinactivation. (1)O(2) generation in the unbound state is quenched by photoinduced electron transfer, whereas (1)O(2) generation can occur in the hydrophobic environment provided by the target protein, after specific binding. Inositol 1,4,5-trisphosphate receptor, which has been suggested to have a hydrophobic pocket around the ligand binding site, was specifically inactivated by an environment-sensitive photosensitizer-conjugated inositol 1,4,5-trisphosphate receptor ligand without (1)O(2) generation in the cytosol of the target cells, despite light illumination, demonstrating the potential of environment-sensitive photosensitizers to allow high-resolution control of generation of reactive oxygen species in the cell.

authors

Yogo T,Urano Y,Mizushima A,Sunahara H,Inoue T,Hirose K,Iino M,Kikuchi K,Nagano T

doi

10.1073/pnas.0611717105

subject

Has Abstract

pub_date

2008-01-08 00:00:00

pages

28-32

issue

1

eissn

0027-8424

issn

1091-6490

pii

0611717105

journal_volume

105

pub_type

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