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The pol III holoenzyme is double-headed, with two core polymerases attached through two ¦Ó-subunits to a g complex. One core is responsible for (presumably) continuous synthesis of the leading strand, the other performs discontinuous synthesis of the lagging strand. The g complex serves as a clamp loader to load the b clamp onto a primed DNA template. Once loaded, the b clamp loses affi nity for the g complex and associates with the core polymerase to help with processive synthesis of an Okazaki fragment. Once the fragment is completed, the b clamp loses affi nity for the core polymerase and associates with the g complex, which acts as a clamp unloader, removing the clamp from the DNA. Then it can recycle to the next primer and repeat the process.
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