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Basic information

Entry
Database: PDB / ID: 8jkv
Titlemembrane proteins
ComponentsHeparan-alpha-glucosaminide N-acetyltransferase
KeywordsMEMBRANE PROTEIN / enzyme / acetylation
Function / homology
Function and homology information


heparan-alpha-glucosaminide N-acetyltransferase / heparan-alpha-glucosaminide N-acetyltransferase activity / MPS IIIC - Sanfilippo syndrome C / heparan sulfate proteoglycan catabolic process / HS-GAG degradation / lysosomal transport / acyltransferase activity / protein complex oligomerization / tertiary granule membrane / specific granule membrane ...heparan-alpha-glucosaminide N-acetyltransferase / heparan-alpha-glucosaminide N-acetyltransferase activity / MPS IIIC - Sanfilippo syndrome C / heparan sulfate proteoglycan catabolic process / HS-GAG degradation / lysosomal transport / acyltransferase activity / protein complex oligomerization / tertiary granule membrane / specific granule membrane / lysosomal lumen / lysosomal membrane / Neutrophil degranulation / plasma membrane
Similarity search - Function
Heparan-alpha-glucosaminide N-acetyltransferase, catalytic domain / Heparan-alpha-glucosaminide N-acetyltransferase, catalytic
Similarity search - Domain/homology
TETRADECANE / CHOLESTEROL / DECANE / DODECANE / N-OCTANE / HEXADECANE / Heparan-alpha-glucosaminide N-acetyltransferase
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.87 Å
AuthorsYu, J. / Ge, J.P. / Ruisheng, X.
Funding support China, 1items
OrganizationGrant numberCountry
Chinese Academy of Sciences China
CitationJournal: Nat Struct Mol Biol / Year: 2024
Title: Structure and mechanism of lysosome transmembrane acetylation by HGSNAT.
Authors: Ruisheng Xu / Yingjie Ning / Fandong Ren / Chenxia Gu / Zhengjiang Zhu / Xuefang Pan / Alexey V Pshezhetsky / Jingpeng Ge / Jie Yu /
Abstract: Lysosomal transmembrane acetylation of heparan sulfates (HS) is catalyzed by HS acetyl-CoA:α-glucosaminide N-acetyltransferase (HGSNAT), whose dysfunction leads to lysosomal storage diseases. The ...Lysosomal transmembrane acetylation of heparan sulfates (HS) is catalyzed by HS acetyl-CoA:α-glucosaminide N-acetyltransferase (HGSNAT), whose dysfunction leads to lysosomal storage diseases. The mechanism by which HGSNAT, the sole non-hydrolase enzyme in HS degradation, brings cytosolic acetyl-coenzyme A (Ac-CoA) and lysosomal HS together for N-acyltransferase reactions remains unclear. Here, we present cryogenic-electron microscopy structures of HGSNAT alone, complexed with Ac-CoA and with acetylated products. These structures explain that Ac-CoA binding from the cytosolic side causes dimeric HGSNAT to form a transmembrane tunnel. Within this tunnel, catalytic histidine and asparagine approach the lumen and instigate the transfer of the acetyl group from Ac-CoA to the glucosamine group of HS. Our study unveils a transmembrane acetylation mechanism that may help advance therapeutic strategies targeting lysosomal storage diseases.
History
DepositionJun 2, 2023Deposition site: PDBJ / Processing site: PDBJ
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Heparan-alpha-glucosaminide N-acetyltransferase
B: Heparan-alpha-glucosaminide N-acetyltransferase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)167,22974
Polymers154,3682
Non-polymers12,86172
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

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Protein , 1 types, 2 molecules AB

#1: Protein Heparan-alpha-glucosaminide N-acetyltransferase / Transmembrane protein 76


Mass: 77183.992 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: HGSNAT, TMEM76 / Production host: Homo sapiens (human)
References: UniProt: Q68CP4, heparan-alpha-glucosaminide N-acetyltransferase

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Sugars , 2 types, 6 molecules

#2: Polysaccharide
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#3: 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.: 2 / Source method: obtained synthetically / Formula: C8H15NO6
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

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Non-polymers , 6 types, 66 molecules

#4: Chemical
ChemComp-D12 / DODECANE


Mass: 170.335 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C12H26
#5: Chemical...
ChemComp-OCT / N-OCTANE


Mass: 114.229 Da / Num. of mol.: 30 / Source method: obtained synthetically / Formula: C8H18
#6: Chemical...
ChemComp-C14 / TETRADECANE


Mass: 198.388 Da / Num. of mol.: 24 / Source method: obtained synthetically / Formula: C14H30
#7: Chemical ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C27H46O
#8: Chemical ChemComp-D10 / DECANE


Mass: 142.282 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H22
#9: Chemical ChemComp-R16 / HEXADECANE


Mass: 226.441 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C16H34

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Details

Has ligand of interestN
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: HG / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
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 / Nominal defocus max: 2000 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.87 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 715945 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0069444
ELECTRON MICROSCOPYf_angle_d0.62412590
ELECTRON MICROSCOPYf_dihedral_angle_d12.0191706
ELECTRON MICROSCOPYf_chiral_restr0.0451416
ELECTRON MICROSCOPYf_plane_restr0.0051440

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