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- PDB-7ppj: human SLFN5 -

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Basic information

Entry
Database: PDB / ID: 7ppj
Titlehuman SLFN5
ComponentsSchlafen family member 5
KeywordsDNA BINDING PROTEIN / nucleotide binding protein antiviral linked to tumorigenesis transcription regulation
Function / homology
Function and homology information


cell differentiation / ATP binding / nucleus
Similarity search - Function
: / Schlafen, GTPase-like domain / Schlafen family / Orthopoxvirus B3 protein / Poxviridae B3 protein / Schlafen, AlbA_2 domain / Schlafen, AlbA_2 domain superfamily / Schlafen, AlbA_2 / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Schlafen family member 5
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.44 Å
AuthorsLammens, K. / Metzner, F.J.
Funding support Germany, 1items
OrganizationGrant numberCountry
German Research Foundation (DFG)CRC1054 Germany
CitationJournal: Nucleic Acids Res / Year: 2022
Title: Structural and biochemical characterization of human Schlafen 5.
Authors: Felix J Metzner / Elisabeth Huber / Karl-Peter Hopfner / Katja Lammens /
Abstract: The Schlafen family belongs to the interferon-stimulated genes and its members are involved in cell cycle regulation, T cell quiescence, inhibition of viral replication, DNA-repair and tRNA ...The Schlafen family belongs to the interferon-stimulated genes and its members are involved in cell cycle regulation, T cell quiescence, inhibition of viral replication, DNA-repair and tRNA processing. Here, we present the cryo-EM structure of full-length human Schlafen 5 (SLFN5) and the high-resolution crystal structure of the highly conserved N-terminal core domain. We show that the core domain does not resemble an ATPase-like fold and neither binds nor hydrolyzes ATP. SLFN5 binds tRNA as well as single- and double-stranded DNA, suggesting a potential role in transcriptional regulation. Unlike rat Slfn13 or human SLFN11, human SLFN5 did not cleave tRNA. Based on the structure, we identified two residues in proximity to the zinc finger motif that decreased DNA binding when mutated. These results indicate that Schlafen proteins have divergent enzymatic functions and provide a structural platform for future biochemical and genetic studies.
History
DepositionSep 14, 2021Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jan 26, 2022Provider: repository / Type: Initial release
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Revision 1.1Feb 2, 2022Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID
Revision 1.2Jul 17, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond / em_admin / Item: _em_admin.last_update
Revision 1.3Jul 9, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details
Item: _em_admin.last_update / _em_software.name / _pdbx_entry_details.has_protein_modification
Revision 1.1Jul 9, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

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Assembly

Deposited unit
A: Schlafen family member 5
hetero molecules


Theoretical massNumber of molelcules
Total (without water)104,4852
Polymers104,4201
Non-polymers651
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area0 Å2
ΔGint0 kcal/mol
Surface area30200 Å2
MethodPISA

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Components

#1: Protein Schlafen family member 5


Mass: 104420.016 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: N-terminal 2 x Flag tag HRV 3C site flexible C-terminus
Source: (gene. exp.) Homo sapiens (human) / Gene: SLFN5 / Production host: Homo sapiens (human) / References: UniProt: Q08AF3
#2: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
Has ligand of interestN
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: full length human Schlafen 5 / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Cell: Expi293F / Plasmid: pcDNA3.1
Buffer solutionpH: 9
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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
Image recordingElectron dose: 41 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.17.1_3660: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.44 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 140715 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0045287
ELECTRON MICROSCOPYf_angle_d0.5857149
ELECTRON MICROSCOPYf_dihedral_angle_d12.631702
ELECTRON MICROSCOPYf_chiral_restr0.045801
ELECTRON MICROSCOPYf_plane_restr0.004913

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