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Open data
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Basic information
Entry | Database: PDB / ID: 8j2f | ||||||
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Title | Human neutral shpingomyelinase | ||||||
![]() | Sphingomyelin phosphodiesterase 2 | ||||||
![]() | MEMBRANE PROTEIN / enzyme | ||||||
Function / homology | ![]() Glycosphingolipid metabolism / sphingomyelin catabolic process / Ceramide signalling / sphingomyelin metabolic process / sphingomyelin phosphodiesterase / sphingomyelin phosphodiesterase activity / sphingolipid catabolic process / ceramide biosynthetic process / TNFR1-mediated ceramide production / phosphoric diester hydrolase activity ...Glycosphingolipid metabolism / sphingomyelin catabolic process / Ceramide signalling / sphingomyelin metabolic process / sphingomyelin phosphodiesterase / sphingomyelin phosphodiesterase activity / sphingolipid catabolic process / ceramide biosynthetic process / TNFR1-mediated ceramide production / phosphoric diester hydrolase activity / caveola / cell periphery / endoplasmic reticulum / metal ion binding / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.07 Å | ||||||
![]() | Zhang, S.S. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Molecular basis for the catalytic mechanism of human neutral sphingomyelinases 1 (hSMPD2). Authors: Jingbo Yi / Boya Qi / Jian Yin / Ruochong Li / Xudong Chen / Junhan Hu / Guohui Li / Sensen Zhang / Yuebin Zhang / Maojun Yang / ![]() Abstract: Enzymatic breakdown of sphingomyelin by sphingomyelinase (SMase) is the main source of the membrane lipids, ceramides, which are involved in many cellular physiological processes. However, the full- ...Enzymatic breakdown of sphingomyelin by sphingomyelinase (SMase) is the main source of the membrane lipids, ceramides, which are involved in many cellular physiological processes. However, the full-length structure of human neutral SMase has not been resolved; therefore, its catalytic mechanism remains unknown. Here, we resolve the structure of human full-length neutral SMase, sphingomyelinase 1 (SMPD2), which reveals that C-terminal transmembrane helices contribute to dimeric architecture of hSMPD2 and that D111 - K116 loop domain is essential for substrate hydrolysis. Coupled with molecular docking, we clarify the binding pose of sphingomyelin, and site-directed mutagenesis further confirms key residues responsible for sphingomyelin binding. Hybrid quantum mechanics/molecular mechanics (QM/MM) molecular dynamic (MD) simulations are utilized to elaborate the catalysis of hSMPD2 with the reported in vitro substrates, sphingomyelin and lyso-platelet activating fator (lyso-PAF). Our study provides mechanistic details that enhance our knowledge of lipid metabolism and may lead to an improved understanding of ceramide in disease and in cancer treatment. | ||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 144.3 KB | Display | ![]() |
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PDB format | ![]() | 113.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 976.6 KB | Display | ![]() |
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Full document | ![]() | 978.9 KB | Display | |
Data in XML | ![]() | 30.9 KB | Display | |
Data in CIF | ![]() | 44 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 35948MC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 47702.508 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() References: UniProt: O60906, sphingomyelin phosphodiesterase #2: Chemical | #3: Chemical | #4: Chemical | Has ligand of interest | N | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: human neutral sphingomyelinases / Type: COMPLEX / Entity ID: #1 / Source: MULTIPLE SOURCES |
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Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 7.2 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1200 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction | Resolution: 3.07 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 220000 / Symmetry type: POINT |