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. 2021 Nov 23;21(1):1–12. doi: 10.1007/s43630-021-00113-y

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Fig. 4 — The helix structure representation of H-subunit (ND1) of complex I and the entrance into Q-binding cavity. A Left, closed structure; B Right, open bottleneck structure. The opening occurs in deformation along the lowest frequency collective PCA mode (Q0), see Movie S1 in SI. The red color represents atoms and residues that contribute most to PCA mode Q0. The un-bending deformation of TM1 helix and the increased size of the bottleneck are two most prominent features of Q0. Details of several other modes are discussed in the text, and further details are given in SI