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- EMDB-73361: Structure of HTTQ23-HAP40 complex bound to a small molecule ligand -

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Basic information

Entry
Database: EMDB / ID: EMD-73361
TitleStructure of HTTQ23-HAP40 complex bound to a small molecule ligand
Map data
Sample
  • Complex: HTT Q23 - HAP40 complex with small molecule ligand
    • Complex: HTT-HAP40
      • Protein or peptide: Huntingtin
      • Protein or peptide: 40-kDa huntingtin-associated protein
    • Complex: Small molecule XS837367
      • Ligand: 2-[(1R)-2,2-difluorocyclopropyl]-N-[(1-methyl-1H-indazol-6-yl)methyl]aniline
KeywordsHuntingtin / Polyglutamine expansion / small molecule ligand / ligand discovery / PEPTIDE BINDING PROTEIN
Function / homology
Function and homology information


vesicle cytoskeletal trafficking / : / positive regulation of CAMKK-AMPK signaling cascade / microtubule-based transport / vocal learning / negative regulation of proteasomal protein catabolic process / positive regulation of mitophagy / regulation of CAMKK-AMPK signaling cascade / profilin binding / positive regulation of cilium assembly ...vesicle cytoskeletal trafficking / : / positive regulation of CAMKK-AMPK signaling cascade / microtubule-based transport / vocal learning / negative regulation of proteasomal protein catabolic process / positive regulation of mitophagy / regulation of CAMKK-AMPK signaling cascade / profilin binding / positive regulation of cilium assembly / retrograde vesicle-mediated transport, Golgi to endoplasmic reticulum / vesicle transport along microtubule / positive regulation of aggrephagy / positive regulation of lipophagy / Golgi organization / dynein intermediate chain binding / dynactin binding / phosphoprotein phosphatase activity / establishment of mitotic spindle orientation / Regulation of MECP2 expression and activity / postsynaptic cytosol / beta-tubulin binding / presynaptic cytosol / heat shock protein binding / inclusion body / centriole / autophagosome / cytoplasmic vesicle membrane / negative regulation of extrinsic apoptotic signaling pathway / protein destabilization / kinase binding / p53 binding / late endosome / transmembrane transporter binding / early endosome / nuclear body / positive regulation of apoptotic process / axon / apoptotic process / dendrite / perinuclear region of cytoplasm / endoplasmic reticulum / Golgi apparatus / protein-containing complex / nucleoplasm / identical protein binding / nucleus / cytosol / cytoplasm
Similarity search - Function
Factor VIII intron 22 protein / Huntingtin / Huntingtin, middle-repeat / Huntingtin family / : / : / : / Huntingtin, N-terminal HEAT / Huntingtin, bridge / Huntingtin, N-terminal HEAT 1 ...Factor VIII intron 22 protein / Huntingtin / Huntingtin, middle-repeat / Huntingtin family / : / : / : / Huntingtin, N-terminal HEAT / Huntingtin, bridge / Huntingtin, N-terminal HEAT 1 / Huntingtin, C-terminal HEAT / Armadillo-like helical / Tetratricopeptide-like helical domain superfamily / Armadillo-type fold
Similarity search - Domain/homology
40-kDa huntingtin-associated protein / Huntingtin
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.3 Å
AuthorsBalakrishnan S / Deme J / Lea SM / Harding RJ
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)Intramural Research Program United States
CitationJournal: Biorxiv / Year: 2025
Title: Identification and Characterization of a Small Molecule Ligand for the Huntingtin-HAP40 Complex
Authors: Balakrishnan S / Deme J / Lea SM / Harding RJ
History
DepositionOct 16, 2025-
Header (metadata) releaseDec 3, 2025-
Map releaseDec 3, 2025-
UpdateDec 3, 2025-
Current statusDec 3, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_73361.png

Downloads & links

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Map

FileDownload / File: emd_73361.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.73 Å/pix.
x 512 pix.
= 374.784 Å		0.73 Å/pix.
x 512 pix.
= 374.784 Å		0.73 Å/pix.
x 512 pix.
= 374.784 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.732 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.07
Minimum - Maximum-0.11237144 - 1.7172638
Average (Standard dev.)0.00082530454 (±0.019828133)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 374.784 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: unsharpened map

Fileemd_73361_additional_1.map
Annotationunsharpened map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_73361_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_73361_half_map_2.map
Projections & Slices
AxesZYX

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Slices (1/2)
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Histogram

Histogram (log scale)

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Sample components

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Entire : HTT Q23 - HAP40 complex with small molecule ligand

EntireName: HTT Q23 - HAP40 complex with small molecule ligand
Components
  • Complex: HTT Q23 - HAP40 complex with small molecule ligand
    • Complex: HTT-HAP40
      • Protein or peptide: Huntingtin
      • Protein or peptide: 40-kDa huntingtin-associated protein
    • Complex: Small molecule XS837367
      • Ligand: 2-[(1R)-2,2-difluorocyclopropyl]-N-[(1-methyl-1H-indazol-6-yl)methyl]aniline

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Supramolecule #1: HTT Q23 - HAP40 complex with small molecule ligand

SupramoleculeName: HTT Q23 - HAP40 complex with small molecule ligand / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 391 KDa

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Supramolecule #2: HTT-HAP40

SupramoleculeName: HTT-HAP40 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1-#2
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: Small molecule XS837367

SupramoleculeName: Small molecule XS837367 / type: complex / ID: 3 / Parent: 1 / Macromolecule list: all / Details: Chemically synthesised
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Huntingtin

MacromoleculeName: Huntingtin / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 349.472344 KDa
Recombinant expressionOrganism: unidentified baculovirus
SequenceString: MATLEKLMKA FESLKSFQQQ QQQQQQQQQQ QQQQQQQQQQ PPPPPPPPPP PQLPQPPPQA QPLLPQPQPP PPPPPPPPGP AVAEEPLHR PKKELSATKK DRVNHCLTIC ENIVAQSVRN SPEFQKLLGI AMELFLLCSD DAESDVRMVA DECLNKVIKA L MDSNLPRL ...String:
MATLEKLMKA FESLKSFQQQ QQQQQQQQQQ QQQQQQQQQQ PPPPPPPPPP PQLPQPPPQA QPLLPQPQPP PPPPPPPPGP AVAEEPLHR PKKELSATKK DRVNHCLTIC ENIVAQSVRN SPEFQKLLGI AMELFLLCSD DAESDVRMVA DECLNKVIKA L MDSNLPRL QLELYKEIKK NGAPRSLRAA LWRFAELAHL VRPQKCRPYL VNLLPCLTRT SKRPEESVQE TLAAAVPKIM AS FGNFAND NEIKVLLKAF IANLKSSSPT IRRTAAGSAV SICQHSRRTQ YFYSWLLNVL LGLLVPVEDE HSTLLILGVL LTL RYLVPL LQQQVKDTSL KGSFGVTRKE MEVSPSAEQL VQVYELTLHH TQHQDHNVVT GALELLQQLF RTPPPELLQT LTAV GGIGQ LTAAKEESGG RSRSGSIVEL IAGGGSSCSP VLSRKQKGKV LLGEEEALED DSESRSDVSS SALTASVKDE ISGEL AASS GVSTPGSAGH DIITEQPRSQ HTLQADSVDL ASCDLTSSAT DGDEEDILSH SSSQVSAVPS DPAMDLNDGT QASSPI SDS SQTTTEGPDS AVTPSDSSEI VLDGTDNQYL GLQIGQPQDE DEEATGILPD EASEAFRNSS MALQQAHLLK NMSHCRQ PS DSSVDKFVLR DEATEPGDQE NKPCRIKGDI GQSTDDDSAP LVHCVRLLSA SFLLTGGKNV LVPDRDVRVS VKALALSC V GAAVALHPES FFSKLYKVPL DTTEYPEEQY VSDILNYIDH GDPQVRGATA ILCGTLICSI LSRSRFHVGD WMGTIRTLT GNTFSLADCI PLLRKTLKDE SSVTCKLACT AVRNCVMSLC SSSYSELGLQ LIIDVLTLRN SSYWLVRTEL LETLAEIDFR LVSFLEAKA ENLHRGAHHY TGLLKLQERV LNNVVIHLLG DEDPRVRHVA AASLIRLVPK LFYKCDQGQA DPVVAVARDQ S SVYLKLLM HETQPPSHFS VSTITRIYRG YNLLPSITDV TMENNLSRVI AAVSHELITS TTRALTFGCC EALCLLSTAF PV CIWSLGW HCGVPPLSAS DESRKSCTVG MATMILTLLS SAWFPLDLSA HQDALILAGN LLAASAPKSL RSSWASEEEA NPA ATKQEE VWPALGDRAL VPMVEQLFSH LLKVINICAH VLDDVAPGPA IKAALPSLTN PPSLSPIRRK GKEKEPGEQA SVPL SPKKG SEASAASRQS DTSGPVTTSK SSSLGSFYHL PSYLKLHDVL KATHANYKVT LDLQNSTEKF GGFLRSALDV LSQIL ELAT LQDIGKCVEE ILGYLKSCFS REPMMATVCV QQLLKTLFGT NLASQFDGLS SNPSKSQGRA QRLGSSSVRP GLYHYC FMA PYTHFTQALA DASLRNMVQA EQENDTSGWF DVLQKVSTQL KTNLTSVTKN RADKNAIHNH IRLFEPLVIK ALKQYTT TT CVQLQKQVLD LLAQLVQLRV NYCLLDSDQV FIGFVLKQFE YIEVGQFRES EAIIPNIFFF LVLLSYERYH SKQIIGIP K IIQLCDGIMA SGRKAVTHAI PALQPIVHDL FVLRGTNKAD AGKELETQKE VVVSMLLRLI QYHQVLEMFI LVLQQCHKE NEDKWKRLSR QIADIILPML AKQQMHIDSH EALGVLNTLF EILAPSSLRP VDMLLRSMFV TPNTMASVST VQLWISGILA ILRVLISQS TEDIVLSRIQ ELSFSPYLIS CTVINRLRDG DSTSTLEEHS EGKQIKNLPE ETFSRFLLQL VGILLEDIVT K QLKVEMSE QQHTFYCQEL GTLLMCLIHI FKSGMFRRIT AAATRLFRSD GCGGSFYTLD SLNLRARSMI TTHPALVLLW CQ ILLLVNH TDYRWWAEVQ QTPKRHSLSS TKLLSPQMSG EEEDSDLAAK LGMCNREIVR RGALILFCDY VCQNLHDSEH LTW LIVNHI QDLISLSHEP PVQDFISAVH RNSAASGLFI QAIQSRCENL STPTMLKKTL QCLEGIHLSQ SGAVLTLYVD RLLC TPFRV LARMVDILAC RRVEMLLAAN LQSSMAQLPM EELNRIQEYL QSSGLAQRHQ RLYSLLDRFR LSTMQDSLSP SPPVS SHPL DGDGHVSLET VSPDKDWYVH LVKSQCWTRS DSALLEGAEL VNRIPAEDMN AFMMNSEFNL SLLAPCLSLG MSEISG GQK SALFEAAREV TLARVSGTVQ QLPAVHHVFQ PELPAEPAAY WSKLNDLFGD AALYQSLPTL ARALAQYLVV VSKLPSH LH LPPEKEKDIV KFVVATLEAL SWHLIHEQIP LSLDLQAGLD CCCLALQLPG LWSVVSSTEF VTHACSLIHC VHFILEAV A VQPGEQLLSP ERRTNTPKAI SEEEEEVDPN TQNPKYITAA CEMVAEMVES LQSVLALGHK RNSGVPAFLT PLLRNIIIS LARLPLVNSY TRVPPLVWKL GWSPKPGGDF GTAFPEIPVE FLQEKEVFKE FIYRINTLGW TSRTQFEETW ATLLGVLVTQ PLVMEQEES PPEEDTERTQ INVLAVQAIT SLVLSAMTVP VAGNPAVSCL EQQPRNKPLK ALDTRFGRKL SIIRGIVEQE I QAMVSKRE NIATHHLYQA WDPVPSLSPA TTGALISHEK LLLQINPERE LGSMSYKLGQ VSIHSVWLGN SITPLREEEW DE EEEEEAD APAPSSPPTS PVNSRKHRAG VDIHSCSQFL LELYSRWILP SSSARRTPAI LISEVVRSLL VVSDLFTERN QFE LMYVTL TELRRVHPSE DEILAQYLVP ATCKAAAVLG MDKAVAEPVS RLLESTLRSS HLPSRVGALH GILYVLECDL LDDT AKQLI PVISDYLLSN LKGIAHCVNI HSQQHVLVMC ATAFYLIENY PLDVGPEFSA SIIQMCGVML SGSEESTPSI IYHCA LRGL ERLLLSEQLS RLDAESLVKL SVDRVNVHSP HRAMAALGLM LTCMYTGKEK VSPGRTSDPN PAAPDSESVI VAMERV SVL FDRIRKGFPC EARVVARILP QFLDDFFPPQ DIMNKVIGEF LSNQQPYPQF MATVVYKVFQ TLHSTGQSSM VRDWVML SL SNFTQRAPVA MATWSLSCFF VSASTSPWVA AILPHVISRM GKLEQVDVNL FCLVATDFYR HQIEEELDRR AFQSVLEV V AAPGSPYHRL LTCLRNVHKV TTCGGSGDYK DDDDK

UniProtKB: Huntingtin

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Macromolecule #2: 40-kDa huntingtin-associated protein

MacromoleculeName: 40-kDa huntingtin-associated protein / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 41.342254 KDa
Recombinant expressionOrganism: unidentified baculovirus
SequenceString: MHHHHHHSSG RENLYFQGMA AAAAGLGGGG AGPGPEAGDF LARYRLVSNK LKKRFLRKPN VAEAGEQFGQ LGRELRAQEC LPYAAWCQL AVARCQQALF HGPGEALALT EAARLFLRQE RDARQRLVCP AAYGEPLQAA ASALGAAVRL HLELGQPAAA A ALCLELAA ...String:
MHHHHHHSSG RENLYFQGMA AAAAGLGGGG AGPGPEAGDF LARYRLVSNK LKKRFLRKPN VAEAGEQFGQ LGRELRAQEC LPYAAWCQL AVARCQQALF HGPGEALALT EAARLFLRQE RDARQRLVCP AAYGEPLQAA ASALGAAVRL HLELGQPAAA A ALCLELAA ALRDLGQPAA AAGHFQRAAQ LQLPQLPLAA LQALGEAASC QLLARDYTGA LAVFTRMQRL AREHGSHPVQ SL PPPPPPA PQPGPGATPA LPAALLPPNS GSAAPSPAAL GAFSDVLVRC EVSRVLLLLL LQPPPAKLLP EHAQTLEKYS WEA FDSHGQ ESSGQLPEEL FLLLQSLVMA THEKDTEAIK SLQVEMWPLL TAEQNHLLHL VLQETISPSG QGV

UniProtKB: 40-kDa huntingtin-associated protein

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Macromolecule #3: 2-[(1R)-2,2-difluorocyclopropyl]-N-[(1-methyl-1H-indazol-6-yl)met...

MacromoleculeName: 2-[(1R)-2,2-difluorocyclopropyl]-N-[(1-methyl-1H-indazol-6-yl)methyl]aniline
type: ligand / ID: 3 / Number of copies: 1 / Formula: A1CYY
Molecular weightTheoretical: 313.344 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

Concentration0.2 mg/mL
BufferpH: 7.4
Component:
ConcentrationFormulaName
25.0 mMC8H18N2O4SHEPES
150.0 mMNaClSodium chloride
0.025 %w/vC8H18N2O4SCHAPS
GridModel: Quantifoil R2/4 / Material: GOLD / Mesh: 300 / Support film - Material: GRAPHENE
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Name: TFS Selectris X
Image recordingFilm or detector model: TFS FALCON 4i (4k x 4k) / Average electron dose: 51.1 e/Å2
Electron beamAcceleration voltage: 300 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 / Nominal magnification: 165000
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 1549562
CTF correctionSoftware - Name: SIMPLE (ver. 3.1) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.3 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 387879
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final 3D classificationSoftware - Name: cryoSPARC
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

6x90


Chain - Chain ID: A / Chain - Source name: PDB / Chain - Initial model type: experimental model
Output model

PDB-9yr6:
Structure of HTTQ23-HAP40 complex bound to a small molecule ligand

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