1887

Abstract

() is a bacterial pathogen that causes listeriosis in immunocompromised individuals, particularly pregnant women. Several virulence factors support the intracellular lifecycle of and facilitate cell-to-cell spread, allowing it to occupy multiple niches within the host and cross-protective barriers, including the placenta. One family of virulence factors, internalins, contributes to pathogenicity by inducing specific uptake and conferring tissue tropism. Over 25 internalins have been identified thus far, but only a few have been extensively studied. Internalins contain leucine-rich repeat (LRR) domains that enable protein-protein interactions, allowing to bind host proteins. Notably, other species express internalins but cannot colonize human hosts, prompting questions regarding the evolution of internalins within the genus . Internalin P (InlP) promotes placental colonization through interaction with the host protein afadin. Although prior studies of InlP have begun to elucidate its role in pathogenesis, there remains a lack of information regarding homologs in other species. Here, we have used a computational evolutionary approach to identify InlP homologs in additional species. We found that () and () encode InlP homologs. We also found InlP-like homologs in and the recently identified species . All newly identified homologs lack the full-length LRR6 and LRR7 domains found in ’s InlP. These findings are informative regarding the evolution of one key virulence factor, InlP, and serve as a springboard for future evolutionary studies of pathogenesis as well as mechanistic studies of internalins.

  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2022-07-29
2024-10-08
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