Sliding-clamp-loader large subunit (also known as Gp44) from Bacteriophage T4 forms the sliding-clamp-loader together with the small subunit. These are members of the AAA+ superfamily of ATPases which form pentameric complexes that load sliding DNA clamps onto the DNA, key for processive chromosomal replication [1,2]. This entry represents the AAA+ ATPase lid domain.

1: Communication between subunits within an archaeal clamp-loader complex. Seybert A, Singleton MR, Cook N, Hall DR, Wigley DB; EMBO J. 2006;25:2209-2218. PMID:16628222

2: How a DNA polymerase clamp loader opens a sliding clamp. Kelch BA, Makino DL, O'Donnell M, Kuriyan J; Science. 2011;334:1675-1680. PMID:22194570