Covington & Burling and Fenwick & West have landed the lead roles on a $3 billion Japanese pharmaceutical deal.

Japan’s second-largest drugmaker, Astellas Pharma Inc., has agreed to acquire San Francisco-based drugmaker Audentes Therapeutics Inc. for about $3 billion in cash. The transaction is expected to be completed in the first quarter of 2020, subject to regulatory approval, including U.S. antitrust clearance.