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. 2023 Jan 9;13(1):135. doi: 10.3390/biom13010135

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© 2023 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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Components of the type VI secretion system (T6SS) identified in C. jejuni. Panels: (A) Identification of C. jejuni homologs to the structural components of Gram-negative T6SS; all components are present except for ClpV, PAAR (tip of the T6SS needle), TagA (functions to stop assembly of the tail), and TssJ (membrane complex) [an alternative model has been published by Cherrak et al. [208]]. (B) Alignment comparison of CJIE3 from C. jejuni strain RM1221 to C. jejuni strain M129 that contains the T6SS; red demonstrates regions present in M129 CJIE3 that are also present in RM1221 CJIE3 and vice versa for blue. The region containing T6SS encoding genes is marked above the M129 CJIE3 region. (C) Percentage of the approximately 13,000 Campylobacter genomes in the PubMLST database that contain CJIE3 based on the size of the hit identity for the element for the two different CJIE3s with or without the T6SS genes.