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The TPR domain of PgaA is a multifunctional scaffold that binds PNAG and modulates PgaB-dependent polymer processing

The synthesis of exopolysaccharides as biofilm matrix components by pathogens is a crucial factor for chronic infections and antibiotic resistance. Many periplasmic proteins involved in polymer processing and secretion in Gram-negative synthase dependent exopolysaccharide biosynthetic systems have b...

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Autores principales: Pfoh, Roland, Subramanian, Adithya S., Huang, Jingjing, Little, Dustin J., Forman, Adam, DiFrancesco, Benjamin R., Balouchestani-Asli, Negar, Kitova, Elena N., Klassen, John S., Pomès, Régis, Nitz, Mark, Howell, P. Lynne
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9384988/
https://www.ncbi.nlm.nih.gov/pubmed/35930610
http://dx.doi.org/10.1371/journal.ppat.1010750
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author Pfoh, Roland
Subramanian, Adithya S.
Huang, Jingjing
Little, Dustin J.
Forman, Adam
DiFrancesco, Benjamin R.
Balouchestani-Asli, Negar
Kitova, Elena N.
Klassen, John S.
Pomès, Régis
Nitz, Mark
Howell, P. Lynne
author_facet Pfoh, Roland
Subramanian, Adithya S.
Huang, Jingjing
Little, Dustin J.
Forman, Adam
DiFrancesco, Benjamin R.
Balouchestani-Asli, Negar
Kitova, Elena N.
Klassen, John S.
Pomès, Régis
Nitz, Mark
Howell, P. Lynne
author_sort Pfoh, Roland
collection PubMed
description The synthesis of exopolysaccharides as biofilm matrix components by pathogens is a crucial factor for chronic infections and antibiotic resistance. Many periplasmic proteins involved in polymer processing and secretion in Gram-negative synthase dependent exopolysaccharide biosynthetic systems have been individually characterized. The operons responsible for the production of PNAG, alginate, cellulose and the Pel polysaccharide each contain a gene that encodes an outer membrane associated tetratricopeptide repeat (TPR) domain containing protein. While the TPR domain has been shown to bind other periplasmic proteins, the functional consequences of these interactions for the polymer remain poorly understood. Herein, we show that the C-terminal TPR region of PgaA interacts with the de-N-acetylase domain of PgaB, and increases its deacetylase activity. Additionally, we found that when the two proteins form a complex, the glycoside hydrolase activity of PgaB is also increased. To better understand structure-function relationships we determined the crystal structure of a stable TPR module, which has a conserved groove formed by three repeat motifs. Tryptophan quenching, mass spectrometry analysis and molecular dynamics simulation studies suggest that the crystallized TPR module can bind PNAG/dPNAG via its electronegative groove on the concave surface, and potentially guide the polymer through the periplasm towards the porin for export. Our results suggest a scaffolding role for the TPR domain that combines PNAG/dPNAG translocation with the modulation of its chemical structure by PgaB.
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spelling pubmed-93849882022-08-18 The TPR domain of PgaA is a multifunctional scaffold that binds PNAG and modulates PgaB-dependent polymer processing Pfoh, Roland Subramanian, Adithya S. Huang, Jingjing Little, Dustin J. Forman, Adam DiFrancesco, Benjamin R. Balouchestani-Asli, Negar Kitova, Elena N. Klassen, John S. Pomès, Régis Nitz, Mark Howell, P. Lynne PLoS Pathog Research Article The synthesis of exopolysaccharides as biofilm matrix components by pathogens is a crucial factor for chronic infections and antibiotic resistance. Many periplasmic proteins involved in polymer processing and secretion in Gram-negative synthase dependent exopolysaccharide biosynthetic systems have been individually characterized. The operons responsible for the production of PNAG, alginate, cellulose and the Pel polysaccharide each contain a gene that encodes an outer membrane associated tetratricopeptide repeat (TPR) domain containing protein. While the TPR domain has been shown to bind other periplasmic proteins, the functional consequences of these interactions for the polymer remain poorly understood. Herein, we show that the C-terminal TPR region of PgaA interacts with the de-N-acetylase domain of PgaB, and increases its deacetylase activity. Additionally, we found that when the two proteins form a complex, the glycoside hydrolase activity of PgaB is also increased. To better understand structure-function relationships we determined the crystal structure of a stable TPR module, which has a conserved groove formed by three repeat motifs. Tryptophan quenching, mass spectrometry analysis and molecular dynamics simulation studies suggest that the crystallized TPR module can bind PNAG/dPNAG via its electronegative groove on the concave surface, and potentially guide the polymer through the periplasm towards the porin for export. Our results suggest a scaffolding role for the TPR domain that combines PNAG/dPNAG translocation with the modulation of its chemical structure by PgaB. Public Library of Science 2022-08-05 /pmc/articles/PMC9384988/ /pubmed/35930610 http://dx.doi.org/10.1371/journal.ppat.1010750 Text en © 2022 Pfoh et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Pfoh, Roland
Subramanian, Adithya S.
Huang, Jingjing
Little, Dustin J.
Forman, Adam
DiFrancesco, Benjamin R.
Balouchestani-Asli, Negar
Kitova, Elena N.
Klassen, John S.
Pomès, Régis
Nitz, Mark
Howell, P. Lynne
The TPR domain of PgaA is a multifunctional scaffold that binds PNAG and modulates PgaB-dependent polymer processing
title The TPR domain of PgaA is a multifunctional scaffold that binds PNAG and modulates PgaB-dependent polymer processing
title_full The TPR domain of PgaA is a multifunctional scaffold that binds PNAG and modulates PgaB-dependent polymer processing
title_fullStr The TPR domain of PgaA is a multifunctional scaffold that binds PNAG and modulates PgaB-dependent polymer processing
title_full_unstemmed The TPR domain of PgaA is a multifunctional scaffold that binds PNAG and modulates PgaB-dependent polymer processing
title_short The TPR domain of PgaA is a multifunctional scaffold that binds PNAG and modulates PgaB-dependent polymer processing
title_sort tpr domain of pgaa is a multifunctional scaffold that binds pnag and modulates pgab-dependent polymer processing
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9384988/
https://www.ncbi.nlm.nih.gov/pubmed/35930610
http://dx.doi.org/10.1371/journal.ppat.1010750
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