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. 2019 Aug 7;17:1123–1134. doi: 10.1016/j.csbj.2019.08.002

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© 2019 Published by Elsevier B.V. on behalf of Research Network of Computational and Structural Biotechnology.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 1 — Refined CST model (CST homology-2^Vrg-4) using the MODELLER package to relax the knotted loop formed between Leu70 and Pro85 by default. The initial model was generated using the SPARKS-X structural modelling tool based on the Vrg-4 template. This current model shows the TMD7 α-helix has a noticeable bend visible in both the ribbon (A) and TMD topology diagram (B). The model structure rotated forward 90° showing the binding site closed to cytosol (C), and rotated back 90° showing the binding site open to Golgi (D).