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. 2021 Feb 22;118(9):e2020393118. doi: 10.1073/pnas.2020393118

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Copyright © 2021 the Author(s). Published by PNAS.

This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).

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Fig. 1. — Constructs and structures of OapB and the OapB–OLE* complex. (A) Sequence and secondary structure and (B) crystal structure of B. halodurans OapB. The N-terminal SBB domain is colored orange, the C-terminal helices are colored violet, and the conserved 27-residue KOW motif is colored green. Encircled N and C letters denote the N and C termini of OapB. (C) Sequence and secondary structure model of the OLE* used in crystallization. Stem P14 is capped with a nonnative UUCG tetraloop (shaded box). Stem P12.2 is made more stable with two nonnative G-C base pairs (lowercase letters). (D) Front and side views of the OapB–OLE* complex crystal structure.