MOSCOW, Jan 16 (Reuters) - One of Russia's most prominent reputed crime bosses was shot dead on a street in central Moscow on Wednesday, law enforcement officials said, less than three years after he survived an assassination attempt. An unidentified gunman shot Aslan Usoyan, 75, known in the underworld of the ex-Soviet Union as "Grandpa Hassan", and he died shortly afterward in hospital, the federal Investigative Committee said. A woman suffered two gunshot wounds.