Initiator proteins in all three domains of life share homology in a region that binds adenosine triphosphate (ATP), placing them in the AAA+ family of adenosine triphosphatases (4).

• 生命中的起始蛋白的所有三级结构域共享一个结合三磷酸腺苷（ATP）的同源区域，使其安置在ATP的AAA+家族。