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. Author manuscript; available in PMC: 2019 Jun 1.
Published in final edited form as: Proteins. 2018 Mar 25;86(6):664–675. doi: 10.1002/prot.25493

Figure 1. Traditional and Updated Module Boundaries for a trans-AT Assembly Line.

Figure 1

The nosperin trans-AT assembly line can be depicted either with traditional modules that start with a KS or C domain and end with an ACP domain or with updated modules that contain a central ACP domain and a downstream extending/transferring/releasing (ETR) enzyme (KS, KS0, C, or TE). All but the twelfth module of the nosperin assembly line belong to the module types defined here (a–y). Gatekeeping ETR enzymes that select one intermediate over another and disconnections between assembly line polypeptides are indicated with gate icons and arrowheads, respectively.