The Turkish government reshuffled the police force yet again overnight, the police said on Wednesday, and sought to expand its power over the judiciary in a move that one former justice minister likened to a coup.

Analysts said both actions appeared calculated to fend off a widening corruption investigation that has plunged the government of Prime Minister Recep Tayyip Erdogan into its worst crisis since it came to power more than a decade ago.

The investigation, which has linked senior politicians to murky business deals, has resulted in the resignation of three ministers, whose sons are under suspicion, as well as a fourth minister. It centers on accusations that officials took bribes in return for bending zoning rules. Turks have been riveted by lurid details leaked to the news media, like the discovery of $4.5 million in cash stuffed in shoe boxes at the home of the director of a state bank.

Mr. Erdogan’s government sent draft legislation to Parliament late Tuesday that would enhance its limited control over the High Council of Judges and Prosecutors, which is responsible for judicial functions, including appointments. The proposed law would grant the justice minister greater authority over legal discipline, judicial investigations, and the appointment of judges and prosecutors, powers the minister does not now have.