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. 2021 Apr 28;13(5):319. doi: 10.3390/toxins13050319

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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The interactions between the α4-helix of MazE-mt9 and the MazF-mt9 dimer. (A) The cocrystal structure (PDB 7DU4) showing the interactions of MazE-mt9 (α4) and the toxin. The hydrogen bonds and the salt bridges concerning the sulfate ion and Asp74 are indicated by the red dashed lines. The sequence alignment between MazE-mt9 (α4) and the C-terminus of MazE-mt1 was shown in the inset. (B) The quantitation of the MazE-mt9/α4 (15 residues) interactions as characterized by ITC. (C) The inhibitory effects of the α4 peptide against the tRNase activity of MazF-mt9.