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‘Fifty Shades’ movie casts Dakota Johnson, Hunnam

From left, Dakota Johnson and Charlie Hunnam.

Getty Images

From left, Dakota Johnson and Charlie Hunnam.

NEW YORK (AP) — The big-screen adaptation of E L James’ ‘‘Fifty Shades of Grey’’ has cast its lead roles.

Charlie Hunnam will play the 27-year-old billionaire Christian Grey, and Dakota Johnson will play the college student he captivates, Anastasia Steele. Focus Features and Universal Pictures announced the castings Monday.

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The 23-year-old Johnson is the daughter of actors Don Johnson and Melanie Griffith. She has had small roles in ‘‘The Social Network’’ and ‘‘21 Jump Street.’’

The 33-year-old British actor Hunnam starred in this summer’s robot-monster battle ‘‘Pacific Rim.’’ He currently stars in the FX series ‘‘Sons of Anarchy.’’

Directed by Sam Taylor-Johnson, the film is to be released next August.

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