7MHZ

Human Hedgehog acyltransferase (HHAT) in complex with a palmitoylated Hedgehog peptide product and a Fab antibody fragment


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Substrate and product complexes reveal mechanisms of Hedgehog acylation by HHAT.

Jiang, Y.Benz, T.L.Long, S.B.

(2021) Science 372: 1215-1219

  • DOI: 10.1126/science.abg4998
  • Primary Citation of Related Structures:  
    7MHY, 7MHZ

  • PubMed Abstract: 
  • Hedgehog proteins govern crucial developmental steps in animals and drive certain human cancers. Before they can function as signaling molecules, Hedgehog precursor proteins must undergo amino-terminal palmitoylation by Hedgehog acyltransferase (HHAT). We present cryo-electron microscopy structures of human HHAT in complex with its palmitoyl-coenzyme A substrate and of a product complex with a palmitoylated Hedgehog peptide at resolutions of 2 ...

    Hedgehog proteins govern crucial developmental steps in animals and drive certain human cancers. Before they can function as signaling molecules, Hedgehog precursor proteins must undergo amino-terminal palmitoylation by Hedgehog acyltransferase (HHAT). We present cryo-electron microscopy structures of human HHAT in complex with its palmitoyl-coenzyme A substrate and of a product complex with a palmitoylated Hedgehog peptide at resolutions of 2.7 and 3.2 angstroms, respectively. The structures reveal how HHAT overcomes the challenges of bringing together substrates that have different physiochemical properties from opposite sides of the endoplasmic reticulum membrane within a membrane-embedded active site for catalysis. These principles are relevant to related enzymes that catalyze the acylation of Wnt and of the appetite-stimulating hormone ghrelin. The structural and mechanistic insights may advance the development of inhibitors for cancer.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA. longs@mskcc.org.



Macromolecules

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Sonic hedgehog protein N-product peptideA [auth B]8Homo sapiensMutation(s): 0 
Gene Names: SHH
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q15465 (Homo sapiens)
Explore Q15465 
Go to UniProtKB:  Q15465
PHAROS:  Q15465
GTEx:  ENSG00000164690 
Entity Groups  
UniProt GroupQ15465
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Protein-cysteine N-palmitoyltransferase HHATB [auth A]493Homo sapiensMutation(s): 0 
Gene Names: HHATMART2SKI1
EC: 2.3.1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q5VTY9 (Homo sapiens)
Explore Q5VTY9 
Go to UniProtKB:  Q5VTY9
PHAROS:  Q5VTY9
GTEx:  ENSG00000054392 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5VTY9
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
3H02 Fab heavy chainC [auth O]462Mus musculusMutation(s): 0 
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Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
3H02 Fab light chainD [auth P]207Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
AJP
Query on AJP

Download Ideal Coordinates CCD File 
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth A],
S [auth A]
Digitonin
C56 H92 O29
UVYVLBIGDKGWPX-KUAJCENISA-N
 Ligand Interaction
PKZ (Subject of Investigation/LOI)
Query on PKZ

Download Ideal Coordinates CCD File 
G [auth A],
H [auth A],
I [auth A]
Palmitoyl-CoA
C37 H66 N7 O17 P3 S
MNBKLUUYKPBKDU-BBECNAHFSA-N
 Ligand Interaction
HEM (Subject of Investigation/LOI)
Query on HEM

Download Ideal Coordinates CCD File 
F [auth A]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
PLM (Subject of Investigation/LOI)
Query on PLM

Download Ideal Coordinates CCD File 
E [auth B]PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data

  • Deposited Date: 2021-04-16 
  • Released Date: 2021-06-16 
  • Deposition Author(s): Long, S.B., Jiang, Y.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35GM131921
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesP30CA008748

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-16
    Type: Initial release
  • Version 1.1: 2021-07-14
    Changes: Database references
  • Version 2.0: 2021-08-25
    Changes: Advisory, Atomic model, Data collection, Database references