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- PDB-8qvx: Structure of the PBD of human SRP68/72 (cryoSPARC 3DFlex) -

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Basic information

Entry
Database: PDB / ID: 8qvx
TitleStructure of the PBD of human SRP68/72 (cryoSPARC 3DFlex)
Components
  • Signal recognition particle subunit SRP68
  • Signal recognition particle subunit SRP72
KeywordsTRANSLATION / Signal recognition particle / TPR / protein translocation
Function / homology
Function and homology information


endoplasmic reticulum signal peptide binding / signal recognition particle, endoplasmic reticulum targeting / signal recognition particle / signal recognition particle binding / 7S RNA binding / SRP-dependent cotranslational protein targeting to membrane / TPR domain binding / SRP-dependent cotranslational protein targeting to membrane / ribosome / response to xenobiotic stimulus ...endoplasmic reticulum signal peptide binding / signal recognition particle, endoplasmic reticulum targeting / signal recognition particle / signal recognition particle binding / 7S RNA binding / SRP-dependent cotranslational protein targeting to membrane / TPR domain binding / SRP-dependent cotranslational protein targeting to membrane / ribosome / response to xenobiotic stimulus / protein domain specific binding / focal adhesion / nucleolus / endoplasmic reticulum / RNA binding / cytosol
Similarity search - Function
Signal recognition particle, SRP72 subunit, RNA-binding / Signal recognition particle, SRP72 subunit / Putative TPR-like repeat / SRP72 RNA-binding domain / Putative TPR-like repeat / Signal recognition particle subunit SRP68 / Signal recognition particle subunit SRP68, RNA-binding domain / SRP68, N-terminal domain superfamily / RNA-binding signal recognition particle 68 / Tetratricopeptide repeat ...Signal recognition particle, SRP72 subunit, RNA-binding / Signal recognition particle, SRP72 subunit / Putative TPR-like repeat / SRP72 RNA-binding domain / Putative TPR-like repeat / Signal recognition particle subunit SRP68 / Signal recognition particle subunit SRP68, RNA-binding domain / SRP68, N-terminal domain superfamily / RNA-binding signal recognition particle 68 / Tetratricopeptide repeat / TPR repeat region circular profile. / TPR repeat profile. / Tetratricopeptide repeats / Tetratricopeptide repeat / Tetratricopeptide-like helical domain superfamily
Similarity search - Domain/homology
Signal recognition particle subunit SRP72 / Signal recognition particle subunit SRP68
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.7 Å
AuthorsZhong, Y. / Feng, J. / Koh, A.F. / Kotecha, A. / Greber, B.J. / Ataide, S.F.
Funding support United Kingdom, 1items
OrganizationGrant numberCountry
Medical Research Council (MRC, United Kingdom)MR/V009354/1 United Kingdom
CitationJournal: Nucleic Acids Res / Year: 2024
Title: Cryo-EM structure of SRP68/72 reveals an extended dimerization domain with RNA-binding activity.
Authors: Yichen Zhong / Junjie Feng / Adrian F Koh / Abhay Kotecha / Basil J Greber / Sandro F Ataide /
Abstract: The signal recognition particle (SRP) is a critical component in protein sorting pathways in all domains of life. Human SRP contains six proteins bound to the 7S RNA and their structures and ...The signal recognition particle (SRP) is a critical component in protein sorting pathways in all domains of life. Human SRP contains six proteins bound to the 7S RNA and their structures and functions have been mostly elucidated. The SRP68/72 dimer is the largest SRP component and is essential for SRP function. Although the structures of the SRP68/72 RNA binding and dimerization domains have been previously reported, the structure and function of large portions of the SRP68/72 dimer remain unknown. Here, we analyse full-length SRP68/72 using cryo-EM and report that SRP68/72 depend on each other for stability and form an extended dimerization domain. This newly observed dimerization domain is both a protein- and RNA-binding domain. Comparative analysis with current structural models suggests that this dimerization domain undergoes dramatic translocation upon SRP docking onto SRP receptor and eventually comes close to the Alu domain. We propose that the SRP68/72 dimerization domain functions by binding and detaching the Alu domain and SRP9/14 from the ribosomal surface, thus releasing elongation arrest upon docking onto the ER membrane.
History
DepositionOct 18, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Oct 30, 2024Provider: repository / Type: Initial release
Revision 1.1May 28, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _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 / _citation_author.identifier_ORCID / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Signal recognition particle subunit SRP68
B: Signal recognition particle subunit SRP72


Theoretical massNumber of molelcules
Total (without water)141,6102
Polymers141,6102
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Signal recognition particle subunit SRP68


Mass: 66617.305 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SRP68 / Production host: Escherichia coli (E. coli) / Strain (production host): BL21 Rosetta / References: UniProt: Q9UHB9
#2: Protein Signal recognition particle subunit SRP72


Mass: 74992.531 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SRP72 / Production host: Escherichia coli (E. coli) / References: UniProt: O76094
Has protein modificationN

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: SRP68/72 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.14 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli) / Strain: BL21 Rosetta
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
110 mMPotassium ChlorideKCl1
2400 mMSodium ChlorideNaCl1
310 mMMagnesium ChlorideMgCl21
450 mMHEPES-KOH1
50.5 mMTCEP1
SpecimenConc.: 0.4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: PIE Scientific Tergeo plasma cleaner / Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 278 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Calibrated magnification: 245614 X / Nominal defocus max: 2000 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 70 e/Å2 / Film or detector model: TFS FALCON 4i (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 18601
EM imaging opticsEnergyfilter name: TFS Selectris X / Energyfilter slit width: 10 eV

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Processing

EM software
IDNameVersionCategoryDetails
1cryoSPARCparticle selectionBlob and template picking
2Topazparticle selection
3EPUimage acquisition
5cryoSPARCCTF correction
8UCSF Chimeramodel fitting
10PHENIX1.21model refinement
11RELION3initial Euler assignment
12cryoSPARCfinal Euler assignment
13RELION4classification
14cryoSPARC3D reconstruction
Image processingDetails: Collected movies in EER format.
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 145826 / Algorithm: FOURIER SPACE / Details: 3D flexible refinement in cryoSPARC / Num. of class averages: 3 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model buildingSource name: AlphaFold / Type: in silico model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0044013
ELECTRON MICROSCOPYf_angle_d0.6465423
ELECTRON MICROSCOPYf_dihedral_angle_d4.255524
ELECTRON MICROSCOPYf_chiral_restr0.04623
ELECTRON MICROSCOPYf_plane_restr0.004701

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