PXD021888

PXD021888 is an original dataset announced via ProteomeXchange.

Title	The lytic polysaccharide monooxygenase of Pseudomonas aeruginosa promotes bacterial survival during systemic infection
Description	Lytic polysaccharide monooxygenases (LPMOs) are a recently discovered enzyme family that cleave polysaccharides by oxidation. Despite proposed roles in bacterial virulence, no direct functional data exist to validate these claims. Here we show that CpbD, the LPMO of the opportunistic pathogen Pseudomonas aeruginosa (PA) is a virulence factor that promotes survival of the bacterium in whole human blood. CbpD was also shown to cleave the glycosidic bonds of the model substrate by an oxidative reaction, a feature that promoted by azurin and pyocyanin. Two redox-active virulence factors co-secreted with the LPMO. Combination of homology modelling, molecular dynamics simulations and small angle X-ray scattering demonstrated that CbpD is a monomeric tri-modular enzyme with highly flexible domain linkers, where domain positioning may be influenced by post translational modifications. Deletion of cbpD rendered P. aeruginosa unable to establish a lethal systemic infection and enhanced bacterial clearance in vivo. Improved bacterial survival of the wildtype was not attributable to dampening of pro-inflammatory responses by the protein, either ex vivo or in vivo. Further quantification of complement products in whole human blood revealed that CbpD reduced the performance of the terminal complement cascade. Importantly, CbpD inactivation by active site mutations abolished both enzyme activity in vitro and function ex vivo, indicating that ligand oxidation is crucial for CbpD virulence function. Finally, profiling of the bacterial and splenic proteome showed that the lack of this single enzyme resulted in substantial re-organization of the bacterial defense systems in vitro and the targeting of distinct host proteins/pathways in vivo.
HostingRepository	PRIDE
AnnounceDate	2021-01-28
AnnouncementXML	Submission_2021-01-28_00:27:23.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Magnus Arntzen
SpeciesList	scientific name: Pseudomonas aeruginosa; NCBI TaxID: 287;
ModificationList	2-pyrrolidone-5-carboxylic acid (Gln); monoacetylated residue; monohydroxylated residue; iodoacetamide derivatized residue; deamidated residue
Instrument	Q Exactive

Revision	Datetime	Status	ChangeLog Entry
0	2020-10-08 01:02:46	ID requested
⏵ 1	2021-01-28 00:27:23	announced

Dataset with its publication pending

submitter keyword: secretome, pellet, CbpD

Gustav Vaaje-Kolstad
contact affiliation	Faculty of Chemistry, Biotechnology and Food Science Norwegian University of Life Sciences Post Office Box 5003 1432, Ås Norway
contact email	gustav.vaaje-kolstad@nmbu.no
lab head
Magnus Arntzen
contact affiliation	Norwegian University of Life Sciences
contact email	magnus.arntzen@nmbu.no
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD021888
     1. Label: PRIDE project
     2. Name: The lytic polysaccharide monooxygenase of Pseudomonas aeruginosa promotes bacterial survival during systemic infection