RsdA_SigD_bd is a domain at the N-terminus of anti-sigma-D factor RsdA proteins. It binds to the -35 promoter binding domain of sigma-D. The complex formed regulates the transcriptional expression of the bacterium [1].

1: Mycobacterium tuberculosis RsdA provides a conformational rationale for selective regulation of sigma-factor activity by proteolysis. Jaiswal RK, Prabha TS, Manjeera G, Gopal B; Nucleic Acids Res. 2013;41:3414-3423. PMID:23314154