You can use your CV as a basis, but it often contains information that is focused at selling yourself to get a new job. So you may have to rewrite it.

Also, a CV is often a bulleted listing of items. Your profile should be a descriptive presentation.

In order to make the scanning of profiles easier, they all have the same structure: (Short intro), Education, Job, Work Experience, Expertise & Skills, Languages, Hobbies and Interests.