[English] 日本語
Yorodumi
- PDB-8hf7: Cryo-EM structure of ComA bound to its mature substrate CSP peptide -

+
Open data


ID or keywords:

Loading...

-
Basic information

Entry
Database: PDB / ID: 8hf7
TitleCryo-EM structure of ComA bound to its mature substrate CSP peptide
Components
  • Competence factor transporting ATP-binding protein/permease ComA
  • Competence-stimulating peptide type 1
KeywordsHYDROLASE / TRANSLOCASE / ABC transport / PCAT
Function / homology
Function and homology information


ABC-type bacteriocin transporter activity / ABC-type oligopeptide transporter activity / cysteine-type peptidase activity / ATP hydrolysis activity / proteolysis / ATP binding / plasma membrane
Similarity search - Function
Peptidase C39, ABC-type bacteriocin transporter / Peptidase family C39 domain profile. / Peptidase C39 family / Peptidase C39, bacteriocin processing / Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site ...Peptidase C39, ABC-type bacteriocin transporter / Peptidase family C39 domain profile. / Peptidase C39 family / Peptidase C39, bacteriocin processing / Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Transport/processing ATP-binding protein ComA
Similarity search - Component
Biological speciesStreptococcus pneumoniae D39 (bacteria)
Streptococcus Streptococcus pneumoniae D39 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsYu, L. / Xin, X. / Min, L.
Funding support Singapore, 1items
OrganizationGrant numberCountry
Ministry of Education (MoE, Singapore)A-0008412-00-00 Singapore
CitationJournal: Nat Commun / Year: 2023
Title: Structural basis of peptide secretion for Quorum sensing by ComA.
Authors: Lin Yu / Xin Xu / Wan-Zhen Chua / Hao Feng / Zheng Ser / Kai Shao / Jian Shi / Yumei Wang / Zongli Li / Radoslaw M Sobota / Lok-To Sham / Min Luo /
Abstract: Quorum sensing (QS) is a crucial regulatory mechanism controlling bacterial signalling and holds promise for novel therapies against antimicrobial resistance. In Gram-positive bacteria, such as ...Quorum sensing (QS) is a crucial regulatory mechanism controlling bacterial signalling and holds promise for novel therapies against antimicrobial resistance. In Gram-positive bacteria, such as Streptococcus pneumoniae, ComA is a conserved efflux pump responsible for the maturation and secretion of peptide signals, including the competence-stimulating peptide (CSP), yet its structure and function remain unclear. Here, we functionally characterize ComA as an ABC transporter with high ATP affinity and determined its cryo-EM structures in the presence or absence of CSP or nucleotides. Our findings reveal a network of strong electrostatic interactions unique to ComA at the intracellular gate, a putative binding pocket for two CSP molecules, and negatively charged residues facilitating CSP translocation. Mutations of these residues affect ComA's peptidase activity in-vitro and prevent CSP export in-vivo. We demonstrate that ATP-Mg triggers the outward-facing conformation of ComA for CSP release, rather than ATP alone. Our study provides molecular insights into the QS signal peptide secretion, highlighting potential targets for QS-targeting drugs.
History
DepositionNov 9, 2022Deposition site: PDBJ / Processing site: RCSB
Revision 1.0Oct 11, 2023Provider: repository / Type: Initial release
Revision 1.1Nov 29, 2023Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year
Revision 1.2Mar 6, 2024Group: Source and taxonomy / Category: em_entity_assembly_naturalsource / entity_src_gen
Item: _em_entity_assembly_naturalsource.ncbi_tax_id / _em_entity_assembly_naturalsource.organism ..._em_entity_assembly_naturalsource.ncbi_tax_id / _em_entity_assembly_naturalsource.organism / _entity_src_gen.pdbx_gene_src_ncbi_taxonomy_id / _entity_src_gen.pdbx_gene_src_scientific_name

-
Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

-
Assembly

Deposited unit
A: Competence factor transporting ATP-binding protein/permease ComA
B: Competence factor transporting ATP-binding protein/permease ComA
D: Competence-stimulating peptide type 1
C: Competence-stimulating peptide type 1


Theoretical massNumber of molelcules
Total (without water)163,1154
Polymers163,1154
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

-
Components

#1: Protein Competence factor transporting ATP-binding protein/permease ComA


Mass: 80433.031 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Streptococcus pneumoniae D39 (bacteria)
Gene: comA / Production host: Escherichia coli (E. coli) / References: UniProt: A0A0B7KN15
#2: Protein/peptide Competence-stimulating peptide type 1


Mass: 1124.378 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Details: Cleaved substrate peptide CSP
Source: (gene. exp.) Streptococcus Streptococcus pneumoniae D39 (bacteria)
Gene: comC1, comC / Production host: Escherichia coli (E. coli)

-
Experimental details

-
Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

-
Sample preparation

ComponentName: ComA / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Streptococcus pneumoniae D39 (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5 / Details: 25 mM Tris, pH 7.5, 150 mM NaCl, 2 mM DTT
SpecimenConc.: 5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 293.15 K

-
Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 1.2 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

-
Processing

EM softwareName: PHENIX / Version: 1.19.2_4158: / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 114803 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0059194
ELECTRON MICROSCOPYf_angle_d1.28312448
ELECTRON MICROSCOPYf_dihedral_angle_d6.1931240
ELECTRON MICROSCOPYf_chiral_restr0.0661516
ELECTRON MICROSCOPYf_plane_restr0.0071556

+
About Yorodumi

-
News

-
Feb 9, 2022. New format data for meta-information of EMDB entries

New format data for meta-information of EMDB entries

  • Version 3 of the EMDB header file is now the official format.
  • The previous official version 1.9 will be removed from the archive.

Related info.:EMDB header

External links:wwPDB to switch to version 3 of the EMDB data model

-
Aug 12, 2020. Covid-19 info

Covid-19 info

URL: https://pdbj.org/emnavi/covid19.php

New page: Covid-19 featured information page in EM Navigator.

Related info.:Covid-19 info / Mar 5, 2020. Novel coronavirus structure data

+
Mar 5, 2020. Novel coronavirus structure data

Novel coronavirus structure data

Related info.:Yorodumi Speices / Aug 12, 2020. Covid-19 info

External links:COVID-19 featured content - PDBj / Molecule of the Month (242)：Coronavirus Proteases

+
Jan 31, 2019. EMDB accession codes are about to change! (news from PDBe EMDB page)

EMDB accession codes are about to change! (news from PDBe EMDB page)

  • The allocation of 4 digits for EMDB accession codes will soon come to an end. Whilst these codes will remain in use, new EMDB accession codes will include an additional digit and will expand incrementally as the available range of codes is exhausted. The current 4-digit format prefixed with “EMD-” (i.e. EMD-XXXX) will advance to a 5-digit format (i.e. EMD-XXXXX), and so on. It is currently estimated that the 4-digit codes will be depleted around Spring 2019, at which point the 5-digit format will come into force.
  • The EM Navigator/Yorodumi systems omit the EMD- prefix.

Related info.:Q: What is EMD? / ID/Accession-code notation in Yorodumi/EM Navigator

External links:EMDB Accession Codes are Changing Soon! / Contact to PDBj

+
Jul 12, 2017. Major update of PDB

Major update of PDB

  • wwPDB released updated PDB data conforming to the new PDBx/mmCIF dictionary.
  • This is a major update changing the version number from 4 to 5, and with Remediation, in which all the entries are updated.
  • In this update, many items about electron microscopy experimental information are reorganized (e.g. em_software).
  • Now, EM Navigator and Yorodumi are based on the updated data.

External links:wwPDB Remediation / Enriched Model Files Conforming to OneDep Data Standards Now Available in the PDB FTP Archive

-
Yorodumi

Thousand views of thousand structures

  • Yorodumi is a browser for structure data from EMDB, PDB, SASBDB, etc.
  • This page is also the successor to EM Navigator detail page, and also detail information page/front-end page for Omokage search.
  • The word "yorodu" (or yorozu) is an old Japanese word meaning "ten thousand". "mi" (miru) is to see.

Related info.:EMDB / PDB / SASBDB / Comparison of 3 databanks / Yorodumi Search / Aug 31, 2016. New EM Navigator & Yorodumi / Yorodumi Papers / Jmol/JSmol / Function and homology information / Changes in new EM Navigator and Yorodumi

Read more