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. 2018 Apr 11;5:31. doi: 10.3389/fmolb.2018.00031

Figure 1.

Figure 1

Structural features of the Type I, Type II, and Type III chaperonins. The comparative structure analysis of Type I, Type II, and Type III chaperonins. Structures were downloaded from the RCSB with codes of PDB: 1AON, 3RUW, and 5X9U, respectively. Type I chaperonin is demarcated into Apical, Intermediate, and Equatorial domains, analogous regions of which are shown in Type II and III chaperonins using dotted lines. Type II chaperonin has a characteristic built-in lid in the structure that plays the role of co-chaperonin GroES of Type I chaperonin. Type III chaperonins are structurally similar to Type II chaperonins in having built-in-lid. However, the sequence, structure and function of the lid are distinct in Type II and Type III chaperonins (An et al., 2017). The PyMOL program (PyMOL Molecular Graphics System, version 1.3) was used to generate this figure.