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- PDB-9lod: Local structure of human FcRL5 bound to IgG-Fc -

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Basic information

Entry
Database: PDB / ID: 9lod
TitleLocal structure of human FcRL5 bound to IgG-Fc
Components
  • Fc receptor-like protein 5
  • Immunoglobulin gamma-1 heavy chain
KeywordsIMMUNE SYSTEM / IgG / FcRL5
Function / homology
Function and homology information


B cell activation / immunoglobulin complex / single fertilization / coreceptor activity / transmembrane signaling receptor activity / adaptive immune response / cell surface receptor signaling pathway / receptor complex / immune response / external side of plasma membrane ...B cell activation / immunoglobulin complex / single fertilization / coreceptor activity / transmembrane signaling receptor activity / adaptive immune response / cell surface receptor signaling pathway / receptor complex / immune response / external side of plasma membrane / cell surface / extracellular region / plasma membrane
Similarity search - Function
: / Immunoglobulin domain / : / Immunoglobulin subtype 2 / Immunoglobulin C-2 Type / Immunoglobulin V-Type / Immunoglobulin V-set domain / Immunoglobulin V-set domain / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. ...: / Immunoglobulin domain / : / Immunoglobulin subtype 2 / Immunoglobulin C-2 Type / Immunoglobulin V-Type / Immunoglobulin V-set domain / Immunoglobulin V-set domain / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. / Immunoglobulin subtype / Immunoglobulin / Immunoglobulin C-Type / Immunoglobulin C1-set / Immunoglobulin C1-set domain / Ig-like domain profile. / Immunoglobulin-like domain / Immunoglobulin-like domain superfamily / Immunoglobulin-like fold
Similarity search - Domain/homology
Immunoglobulin gamma-1 heavy chain / Fc receptor-like protein 5
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.16 Å
AuthorsChen, S.H. / Xiao, J.Y.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Sci Adv / Year: 2026
Title: Human FcRL5 is an Fc receptor that simultaneously engages two IgGs.
Authors: Shihua Chen / Shuhan Li / Zhiying Zhang / Junyu Xiao /
Abstract: The Fc receptors play crucial roles in initiating the effector functions of immunoglobulins. FcRL5 is a prominent target in B cell malignancies and has been implicated as a receptor for ...The Fc receptors play crucial roles in initiating the effector functions of immunoglobulins. FcRL5 is a prominent target in B cell malignancies and has been implicated as a receptor for immunoglobulin G (IgG). However, the molecular mechanism remained unclear. Here, we demonstrate that human FcRL5, but not its mouse counterpart, is a bona fide IgG-Fc (Fcγ) receptor that uniquely requires the presence of two Fcγ molecules in close proximity to form a robust interaction. Cryo-electron microscopy reveals that FcRL5 optimally engages two Fcγ molecules positioned at a 60° angle, with its D1-D2 domains binding to the first Fcγ molecule, while its D3 domain arches over the second Fcγ. This distinctive binding capability enables FcRL5 to specifically recognize IgG immune complexes (ICs), with the binding strength correlating with IgG concentration in the ICs. In addition, we demonstrate that FcRL5 can internalize the IgG polymer and IC. These results shed light on FcRL5 function and reveal a unique Fcγ-FcγR binding mode governed by avidity.
History
DepositionJan 23, 2025Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Nov 26, 2025Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Fc receptor-like protein 5
B: Immunoglobulin gamma-1 heavy chain
C: Immunoglobulin gamma-1 heavy chain
D: Immunoglobulin gamma-1 heavy chain
E: Immunoglobulin gamma-1 heavy chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)209,1108
Polymers206,8395
Non-polymers2,2713
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 Fc receptor-like protein 5 / FcR-like protein 5 / FcRL5 / BXMAS1 / Fc receptor homolog 5 / FcRH5 / Immune receptor translocation- ...FcR-like protein 5 / FcRL5 / BXMAS1 / Fc receptor homolog 5 / FcRH5 / Immune receptor translocation-associated protein 2


Mass: 94512.047 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: FCRL5, FCRH5, IRTA2, UNQ503/PRO820 / Production host: Homo sapiens (human) / References: UniProt: Q96RD9
#2: Antibody
Immunoglobulin gamma-1 heavy chain / Immunoglobulin gamma-1 heavy chain NIE


Mass: 28081.764 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human) / References: UniProt: P0DOX5
#3: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1- ...2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1098.016 Da / Num. of mol.: 1 / Source method: obtained synthetically
DescriptorTypeProgram
DGlcpNAcb1-2DManpa1-6DManpb1-4DGlcpNAcb1-4[LFucpa1-6]DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/4,6,5/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5][a1221m-1a_1-5]/1-1-2-3-1-4/a4-b1_a6-f1_b4-c1_c6-d1_d2-e1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(6+1)][a-D-Manp]{[(2+1)][b-D-GlcpNAc]{}}}}[(6+1)][a-L-Fucp]{}}}LINUCSPDB-CARE
#4: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1- ...2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 951.875 Da / Num. of mol.: 1 / Source method: obtained synthetically
DescriptorTypeProgram
DGlcpNAcb1-2DManpa1-6DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,5,4/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-1/a4-b1_b4-c1_c6-d1_d2-e1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(6+1)][a-D-Manp]{[(2+1)][b-D-GlcpNAc]{}}}}}}LINUCSPDB-CARE
#5: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C8H15NO6 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
Has ligand of interestY
Has protein modificationY

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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: Complex of human FcRL5 with IgG-Fc / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.2
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: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: OTHER / Nominal defocus max: 1700 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.16 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 257893 / Symmetry type: POINT

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