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SlideshowReport

Structure and action of the T7 phage gene 4 helicase

Description
(a,b) Comparison of T7 gp4 action with that of the ATP synthase rotary engine.

Shaded subunits in both enzymes depict noncatalytic sites.

In the example shown the conformational change in T7 gp4 occurs directly after hydrolysis of dTTP at site 1.
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