PXD067252

PXD067252 is an original dataset announced via ProteomeXchange.

Title	Unraveling the pathway of Copper Delivery to Cytochrome c oxidases in the Free-Living Bacterium Caulobacter vibrioides
Description	Copper (Cu) is an essential micronutrient that serves as a cofactor for many enzymes but becomes toxic when present in excess. In most bacteria, CopA-like P1B-type ATPases mediate Cu detoxification by exporting cytoplasmic Cu to the periplasm or extracellular environment. In this study, we show that Caulobacter vibrioides lacks a canonical CopA-like ATPase but encodes a single FixI/CcoI-type Cu-transporting ATPase, previously implicated in Cu delivery to the cbb₃-type cytochrome c oxidase (Cox) in species such as Rhodobacter capsulatus. C. vibrioides harbors two terminal cytochrome c oxidases in its cytoplasmic membrane: an aa₃-type and a cbb₃-type Cox. We also demonstrate that the activity of cbb₃-Cox requires the FixI-type Cu transporter and the periplasmic Cu chaperone PccA. In contrast, aa₃-Cox activity depends on PccA and the inner membrane-bound protein CtaG. Since the mechanism of Cu acquisition for aa₃-Cox remains largely unknown, we conducted a genetic screen and identified a novel outer membrane TonB-dependent receptor (TccA) that is specifically required for aa₃-Cox function. We also showed that cbb₃-Cox is upregulated under microaerobic conditions, possibly such as those encountered on solid media where O2 diffusion is limited. Under normoxic conditions, the expression and the activity of cbb₃-Cox decrease, and aa₃-Cox becomes the predominant terminal oxidase. These findings demonstrate that C. vibrioides differentially utilizes its Cox enzymes in response to O2 availability and relies on a distinct Cu trafficking pathway for their maturation, including an outer membrane component that has not been previously described in bacterial Cu homeostasis.
HostingRepository	PRIDE
AnnounceDate	2026-04-22
AnnouncementXML	Submission_2026-04-22_09:19:04.764.xml
DigitalObjectIdentifier	https://doi.org/10.6019/PXD067252
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Supported dataset by repository
PrimarySubmitter	Marc Dieu
SpeciesList	scientific name: Caulobacter crescentus (strain NA1000 / CB15N); NCBI TaxID: NEWT:565050;
ModificationList	monohydroxylated residue; iodoacetamide derivatized residue
Instrument	timsTOF Pro

Revision	Datetime	Status	ChangeLog Entry
0	2025-08-12 03:21:07	ID requested
⏵ 1	2026-04-22 09:19:05	announced

10.6019/PXD067252;

10.1016/J.JBC.2025.110786;

submitter keyword: Caulobacter vibrioides, metal transport, oxygen limitation, P1B-type ATPase, cytochrome c oxidase,Copper

Jean-Yves Matroule
contact affiliation	Research Unit in Microorganisms Biology (URBM), Department of Biology, Namur Research Institute for Life Sciences (NARILIS), University of Namur, Namur, Belgium
contact email	jean-yves.matroule@unamur.be
lab head
Marc Dieu
contact affiliation	University of Namur - MaSUN
contact email	marc.dieu@unamur.be
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD067252
     1. Label: PRIDE project
     2. Name: Unraveling the pathway of Copper Delivery to Cytochrome c oxidases in the Free-Living Bacterium Caulobacter vibrioides