Part of a complex that catalyzes the reversible cleavage of acetyl-CoA, allowing growth on acetate as sole source of carbon and energy. Probably maintains the overall quaternary structure of the ACDS complex (By similarity). One-carbon metabolism; methanogenesis from acetate. Heterodimer of delta and gamma chains. The ACDS complex is made up of alpha, epsilon, beta, gamma and delta chains with a probable stoichiometry of (alpha(2)epsilon(2))(4)-beta(8)-(gamma(1)delta(1))(8) (Potential). Belongs to the CdhD family.