TOKYO, Jan 16 : Japanese trading house Mitsubishi Corp said on Friday it would take over the U.S. shale production and infrastructure assets of Aethon Energy Management for $7.53 billion to strengthen its gas value chain. The deal - the biggest acquisition to date by Mitsubishi - would give the company a substantial natural gas operation adjacent to the U.S. Gulf Coast and the energy export facilities being developed there. The transaction includes $5.2 billion to acquire Aethon's equity