JOHANNESBURG - Former public enterprises minister Lynne Brown wanted to clear her name at the state capture inquiry.
Brown was applying to cross-examine witnesses on Thursday.
She has been widely criticised for allegedly facilitating the capture of state-owned enterprises.
However, her appeal was dismissed on Thursday morning.
Former deputy finance minister Mcebis Jonas told the inquiry during his testimony that a Gupta brother bragged about controlling Brown.
The comment was allegedly made during a meeting where the Guptas apparently offered him the job of finance minister.
In February, the Public Protector found Brown guilty of misleading parliament after she denied that Eskom had contracts with a Gupta-linked firm.