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. Author manuscript; available in PMC: 2014 Mar 4.
Published in final edited form as: Virology. 2013 Aug 27;446(1-2):133–143. doi: 10.1016/j.virol.2013.07.025

Fig. 1.

Fig. 1

Illustration of the phi29 DNA-packaging motor hexameric structure. (A) Side view (left) and top view (right) of the phi29 packaging motor and pRNA hexamer. The 30° tilt of the helix of the channel subunit is depicted in both external and internal views. (Bottom) Side and bottom views of hexameric pRNA derived from 3WJ crystal structures (Zhang et al., in press). (B, C) The contact at every 30° for twelve 30° transitions translocates dsDNA one helical turn through the connector. (D) AFM images of pRNA hexamer. (E) Hexameric motor models of helicase FtsK and B204 NTPase. (A) and (C), adapted from Zhao et al. (2013), © 2013 with permission from American Chemical Society; (B) and (D), adapted from Schwartz et al. (2013b), © 2013 with permission from Elsevier; (E) upper panel, adapted from Happonen et al. (2013), © 2013 with permission from American Society for Microbiology, and lower panel, adapted from Massey et al. (2006), © 2006 with permission from Elsevier.