Murad Bayar, who had been the secretary of state for defence industries for 10 years, was sacked with immediate effect, the Anatolia news agency said, citing the official gazette but without stating the reason.
Bayar had been a key player in negotiations to buy Turkey's first long-range anti-missile system with the defence contractor China Precision Machinery Export-Import Corp -- a deal estimated to be worth USD 4 billion.
The United States had voiced concern over Turkey's decision to enter talks with the company, which is currently subject to US sanctions for selling arms and missile technology to Iran and Syria.
Turkey, a NATO member since 1952, defended its decision to enter into negotiations with the company, saying the Chinese firm had offered the most competitive price, as well as co-production in Turkey and the option of a technology transfer.