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- EMDB-52437: PSMA in complex with nanobody 37 -

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Basic information

Entry
Database: EMDB / ID: EMD-52437
TitlePSMA in complex with nanobody 37
Map dataPSMA with nanobody 37
Sample
  • Complex: PSMA in complex with nanobody 8
    • Protein or peptide: Glutamate carboxypeptidase 2
    • Protein or peptide: Nanobody 37
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: ZINC ION
  • Ligand: CALCIUM ION
  • Ligand: CHLORIDE ION
Keywordscarboxypeptidase complex nanobody / MEMBRANE PROTEIN
Function / homology
Function and homology information


Ac-Asp-Glu binding / tetrahydrofolyl-poly(glutamate) polymer binding / glutamate carboxypeptidase II / folic acid-containing compound metabolic process / C-terminal protein deglutamylation / Aspartate and asparagine metabolism / dipeptidase activity / carboxypeptidase activity / metallocarboxypeptidase activity / peptidase activity ...Ac-Asp-Glu binding / tetrahydrofolyl-poly(glutamate) polymer binding / glutamate carboxypeptidase II / folic acid-containing compound metabolic process / C-terminal protein deglutamylation / Aspartate and asparagine metabolism / dipeptidase activity / carboxypeptidase activity / metallocarboxypeptidase activity / peptidase activity / cell surface / proteolysis / extracellular exosome / metal ion binding / membrane / plasma membrane / cytoplasm
Similarity search - Function
Transferrin receptor-like, dimerisation domain / Transferrin receptor-like, dimerisation domain superfamily / Glutamate carboxypeptidase 2-like / Transferrin receptor-like dimerisation domain / PA domain superfamily / PA domain / PA domain / Peptidase M28 / Peptidase family M28
Similarity search - Domain/homology
Glutamate carboxypeptidase 2
Similarity search - Component
Biological speciesCamelus (mammal) / Homo sapiens (human) / Camelus dromedarius (Arabian camel)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.71 Å
AuthorsAlon G / Zalk R / Huynh TT / Zalutsky MR / Weizmann Y / Zarivach R / Papo N
Funding support United States, United Kingdom, Israel, 6 items
OrganizationGrant numberCountry
Other private846497
United States - Israel Binational Science Foundation (BSF)2019303 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM144393 United States
Rosetrees TrustOoR2022/100004 United Kingdom
Israel Science Foundation1615/19 Israel
Worldwide Cancer Research20-0238 United Kingdom
CitationJournal: Int J Biol Macromol / Year: 2025
Title: Structural analysis of nanobody interactions with their prostate-specific membrane antigen binding epitopes.
Authors: Gal Alon-Zchut / Ran Zalk / Truc T Huynh / Michael R Zalutsky / Yossi Weizmann / Raz Zarivach / Niv Papo /
Abstract: Prostate-specific membrane antigen (PSMA), overexpressed in prostate cancer, is a promising target for diagnostics and therapy. However, the monoclonal antibodies in current use for PSMA targeting ...Prostate-specific membrane antigen (PSMA), overexpressed in prostate cancer, is a promising target for diagnostics and therapy. However, the monoclonal antibodies in current use for PSMA targeting and inhibition have suboptimal activities due to their poor tissue and cell penetration and slow normal tissue clearance. Potentially superior alternatives are nanobodies (NBs), the single-chain variable domains of heavy-chain antibodies derived from camelids. The advantages of NBs include small size (~15 kDa), ability to bind hidden epitopes, and rapid clearance. In contrast to most known PSMA inhibitors, which bind to the same catalytic site in PMSA, NBs can bind to different PSMA epitopes, facilitating heterovalent binding strategies that could enhance their therapeutic and diagnostic potential. The objective of this study was to map these binding epitopes and hence to acquire an atomic-resolution understanding of NB-PMSA binding by investigating the structural interactions between PSMA and three NBs (NB7, NB8, and NB37). Using cryo-electron microscopy to generate high-resolution structures of NB-PSMA complexes, we found that NB7 had the highest affinity for PSMA due to a larger interface and to stabilizing interactions, including salt bridges and π-π stacking. Notably, we also found that NB7 and NB8 can bind simultaneously to different PSMA epitopes without interfering with the function of PSMA (which is still not completely known), opening the way for the development of theranostic applications for prostate cancer treatment and imaging. Importantly, NB7 binds specifically to human PSMA but not to murine PSMA, due to key amino acid differences responsible for its species specificity.
History
DepositionDec 29, 2024-
Header (metadata) releaseJul 23, 2025-
Map releaseJul 23, 2025-
UpdateJul 23, 2025-
Current statusJul 23, 2025Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_52437.png

Downloads & links

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Map

FileDownload / File: emd_52437.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationPSMA with nanobody 37
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.89 Å/pix.
x 256 pix.
= 227.84 Å		0.89 Å/pix.
x 256 pix.
= 227.84 Å		0.89 Å/pix.
x 256 pix.
= 227.84 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.89 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.2
Minimum - Maximum-1.9996414 - 2.7655091
Average (Standard dev.)-0.00041903104 (±0.07357618)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 227.84 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: PSMA with nanobody 37 halfA

Fileemd_52437_half_map_1.map
AnnotationPSMA with nanobody 37 halfA
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: PSMA with nanobody 37 halfB

Fileemd_52437_half_map_2.map
AnnotationPSMA with nanobody 37 halfB
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : PSMA in complex with nanobody 8

EntireName: PSMA in complex with nanobody 8
Components
  • Complex: PSMA in complex with nanobody 8
    • Protein or peptide: Glutamate carboxypeptidase 2
    • Protein or peptide: Nanobody 37
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: ZINC ION
  • Ligand: CALCIUM ION
  • Ligand: CHLORIDE ION

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Supramolecule #1: PSMA in complex with nanobody 8

SupramoleculeName: PSMA in complex with nanobody 8 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Camelus (mammal)
Molecular weightTheoretical: 230 KDa

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Macromolecule #1: Glutamate carboxypeptidase 2

MacromoleculeName: Glutamate carboxypeptidase 2 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO / EC number: glutamate carboxypeptidase II
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 78.341352 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: HNMKAFLDEL KAENIKKFLY NFTQIPHLAG TEQNFQLAKQ IQSQWKEFGL DSVELAHYDV LLSYPNKTHP NYISIINEDG NEIFNTSLF EPPPPGYENV SDIVPPFSAF SPQGMPEGDL VYVNYARTED FFKLERDMKI NCSGKIVIAR YGKVFRGNKV K NAQLAGAK ...String:
HNMKAFLDEL KAENIKKFLY NFTQIPHLAG TEQNFQLAKQ IQSQWKEFGL DSVELAHYDV LLSYPNKTHP NYISIINEDG NEIFNTSLF EPPPPGYENV SDIVPPFSAF SPQGMPEGDL VYVNYARTED FFKLERDMKI NCSGKIVIAR YGKVFRGNKV K NAQLAGAK GVILYSDPAD YFAPGVKSYP DGWNLPGGGV QRGNILNLNG AGDPLTPGYP ANEYAYRRGI AEAVGLPSIP VH PIGYYDA QKLLEKMGGS APPDSSWRGS LKVPYNVGPG FTGNFSTQKV KMHIHSTNEV TRIYNVIGTL RGAVEPDRYV ILG GHRDSW VFGGIDPQSG AAVVHEIVRS FGTLKKEGWR PRRTILFASW DAEEFGLLGS TEWAEENSRL LQERGVAYIN ADSS IEGNY TLRVDCTPLM YSLVHNLTKE LKSPDEGFEG KSLYESWTKK SPSPEFSGMP RISKLGSGND FEVFFQRLGI ASGRA RYTK NWETNKFSGY PLYHSVYETY ELVEKFYDPM FKYHLTVAQV RGGMVFELAN SIVLPFDCRD YAVVLRKYAD KIYSIS MKH PQEMKTYSVS FDSLFSAVKN FTEIASKFSE RLQDFDKSNP IVLRMMNDQL MFLERAFIDP LGLPDRPFYR HVIYAPS SH NKYAGESFPG IYDALFDIES KVDPSKAWGE VKRQIYVAAF TVQAAAETLS EVA

UniProtKB: Glutamate carboxypeptidase 2

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Macromolecule #2: Nanobody 37

MacromoleculeName: Nanobody 37 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Camelus dromedarius (Arabian camel)
Molecular weightTheoretical: 12.712949 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
VQLQESGGGS LRLSCARSGW PYSTYSMNWF RQAPGKEREA VAGISSTMSG IIFAESKAGQ FTISQDNAKN TVYLQMNNLK PEDTAIYYC AARRDYSLSS SSDDFDYWGQ GTQVTV

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Macromolecule #6: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 6 / Number of copies: 8 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Macromolecule #7: ZINC ION

MacromoleculeName: ZINC ION / type: ligand / ID: 7 / Number of copies: 4 / Formula: ZN
Molecular weightTheoretical: 65.409 Da

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Macromolecule #8: CALCIUM ION

MacromoleculeName: CALCIUM ION / type: ligand / ID: 8 / Number of copies: 2 / Formula: CA
Molecular weightTheoretical: 40.078 Da

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Macromolecule #9: CHLORIDE ION

MacromoleculeName: CHLORIDE ION / type: ligand / ID: 9 / Number of copies: 1 / Formula: CL
Molecular weightTheoretical: 35.453 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 8
VitrificationCryogen name: ETHANE / Instrument: HOMEMADE PLUNGER / Details: manually blotted for 3 seconds.

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Electron microscopy

MicroscopeTFS GLACIOS
Image recordingFilm or detector model: TFS FALCON 4i (4k x 4k) / Average electron dose: 30.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.5 µm

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Image processing

CTF correctionType: NONE
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.71 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 347525
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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