[English] 日本語
Yorodumi
- PDB-8j2f: Human neutral shpingomyelinase -

+
Open data


ID or keywords:

Loading...

-
Basic information

Entry
Database: PDB / ID: 8j2f
TitleHuman neutral shpingomyelinase
ComponentsSphingomyelin phosphodiesterase 2
KeywordsMEMBRANE PROTEIN / enzyme
Function / homology
Function and homology information


sphingomyelin metabolic process / sphingomyelin catabolic process / Ceramide signalling / sphingomyelin phosphodiesterase / sphingomyelin phosphodiesterase activity / Glycosphingolipid catabolism / ceramide biosynthetic process / phosphoric diester hydrolase activity / sphingolipid catabolic process / TNFR1-mediated ceramide production ...sphingomyelin metabolic process / sphingomyelin catabolic process / Ceramide signalling / sphingomyelin phosphodiesterase / sphingomyelin phosphodiesterase activity / Glycosphingolipid catabolism / ceramide biosynthetic process / phosphoric diester hydrolase activity / sphingolipid catabolic process / TNFR1-mediated ceramide production / response to mechanical stimulus / cell periphery / caveola / intracellular signal transduction / endoplasmic reticulum / metal ion binding / plasma membrane
Similarity search - Function
Sphingomyelin phosphodiesterase 2-like / Endonuclease/exonuclease/phosphatase / Endonuclease/Exonuclease/phosphatase family / Endonuclease/exonuclease/phosphatase superfamily
Similarity search - Domain/homology
TETRADECANE / HEPTANE / Sphingomyelin phosphodiesterase 2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.07 Å
AuthorsZhang, S.S.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32030056 China
CitationJournal: Nat Commun / Year: 2023
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.
History
DepositionApr 14, 2023Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Dec 6, 2023Provider: repository / Type: Initial release
Revision 1.1May 1, 2024Group: Database references / Category: citation / citation_author
Item: _citation.page_last / _citation.pdbx_database_id_PubMed ..._citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID

-
Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

-
Assembly

Deposited unit
A: Sphingomyelin phosphodiesterase 2
B: Sphingomyelin phosphodiesterase 2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)96,0518
Polymers95,4052
Non-polymers6466
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

-
Components

#1: Protein Sphingomyelin phosphodiesterase 2 / Lyso-platelet-activating factor-phospholipase C / Lyso-PAF-PLC / Neutral sphingomyelinase / N-SMase ...Lyso-platelet-activating factor-phospholipase C / Lyso-PAF-PLC / Neutral sphingomyelinase / N-SMase / nSMase / nSMase1


Mass: 47702.508 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SMPD2 / Production host: Homo sapiens (human)
References: UniProt: O60906, sphingomyelin phosphodiesterase
#2: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Mg
#3: Chemical ChemComp-HP6 / HEPTANE


Mass: 100.202 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C7H16
#4: Chemical ChemComp-C14 / TETRADECANE


Mass: 198.388 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C14H30
Has ligand of interestN

-
Experimental details

-
Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

-
Sample preparation

ComponentName: human neutral sphingomyelinases / Type: COMPLEX / Entity ID: #1 / Source: MULTIPLE SOURCES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.2
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

-
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: 1200 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

-
Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.07 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 220000 / Symmetry type: POINT

+
About Yorodumi

-
News

-
Feb 9, 2022. New format data for meta-information of EMDB entries

New format data for meta-information of EMDB entries

  • Version 3 of the EMDB header file is now the official format.
  • The previous official version 1.9 will be removed from the archive.

Related info.:EMDB header

External links:wwPDB to switch to version 3 of the EMDB data model

-
Aug 12, 2020. Covid-19 info

Covid-19 info

URL: https://pdbj.org/emnavi/covid19.php

New page: Covid-19 featured information page in EM Navigator.

Related info.:Covid-19 info / Mar 5, 2020. Novel coronavirus structure data

+
Mar 5, 2020. Novel coronavirus structure data

Novel coronavirus structure data

Related info.:Yorodumi Speices / Aug 12, 2020. Covid-19 info

External links:COVID-19 featured content - PDBj / Molecule of the Month (242)：Coronavirus Proteases

+
Jan 31, 2019. EMDB accession codes are about to change! (news from PDBe EMDB page)

EMDB accession codes are about to change! (news from PDBe EMDB page)

  • The allocation of 4 digits for EMDB accession codes will soon come to an end. Whilst these codes will remain in use, new EMDB accession codes will include an additional digit and will expand incrementally as the available range of codes is exhausted. The current 4-digit format prefixed with “EMD-” (i.e. EMD-XXXX) will advance to a 5-digit format (i.e. EMD-XXXXX), and so on. It is currently estimated that the 4-digit codes will be depleted around Spring 2019, at which point the 5-digit format will come into force.
  • The EM Navigator/Yorodumi systems omit the EMD- prefix.

Related info.:Q: What is EMD? / ID/Accession-code notation in Yorodumi/EM Navigator

External links:EMDB Accession Codes are Changing Soon! / Contact to PDBj

+
Jul 12, 2017. Major update of PDB

Major update of PDB

  • wwPDB released updated PDB data conforming to the new PDBx/mmCIF dictionary.
  • This is a major update changing the version number from 4 to 5, and with Remediation, in which all the entries are updated.
  • In this update, many items about electron microscopy experimental information are reorganized (e.g. em_software).
  • Now, EM Navigator and Yorodumi are based on the updated data.

External links:wwPDB Remediation / Enriched Model Files Conforming to OneDep Data Standards Now Available in the PDB FTP Archive

-
Yorodumi

Thousand views of thousand structures

  • Yorodumi is a browser for structure data from EMDB, PDB, SASBDB, etc.
  • This page is also the successor to EM Navigator detail page, and also detail information page/front-end page for Omokage search.
  • The word "yorodu" (or yorozu) is an old Japanese word meaning "ten thousand". "mi" (miru) is to see.

Related info.:EMDB / PDB / SASBDB / Comparison of 3 databanks / Yorodumi Search / Aug 31, 2016. New EM Navigator & Yorodumi / Yorodumi Papers / Jmol/JSmol / Function and homology information / Changes in new EM Navigator and Yorodumi

Read more