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Figure 4 | Cell & Bioscience

Figure 4

From: Finding of widespread viral and bacterial revolution dsDNA translocation motors distinct from rotation motors by channel chirality and size

Figure 4

Secondary and crystal structures of motor channels of different bacteriophages demonstrating left-handed channel wall with a twisting of 30° leftward. (A) The 3D structure of Phi29 (P04332), HK97 (Q6NFR1), SPP1 (P54309), P22 (P26744) were predicted using the program PredictProtein with default parameter (http://www.predictprotein.org), revealing the 30° left-handed regions correlated well with their respected crystal structures (PDB:Phi29-gp10, 1H5W; HK97 family-portal protein, 3KDR; SPP1-gp6, 2JES; P22-gp1, 3LJ5). The location of the 30° left-handed tilted helix in each bacteriophage connector protein subunit is framed, which all lay at the end of the α β motif. (B) The 30° tilt helix (red) is also shown in an external view in connector 3D structures of different bacteriophages, supporting the common mechanism that DNA revolves through the 30° tilted channel by an anti-chiral arrangement in dsDNA translocation.

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