[English] 日本語
Yorodumi
- EMDB-3684: Structure of a pre-catalytic spliceosome (B3 map) -

+
Open data


ID or keywords:

Loading...

-
Basic information

Entry
Database: EMDB / ID: EMD-3684
TitleStructure of a pre-catalytic spliceosome (B3 map)
Map datasharpened B3 map
Sample
  • Complex: Pre-catalytic B complex Spliceosome
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 17.2 Å
AuthorsPlaschka C / Lin P-C / Nagai K
CitationJournal: Nature / Year: 2017
Title: Structure of a pre-catalytic spliceosome.
Authors: Clemens Plaschka / Pei-Chun Lin / Kiyoshi Nagai /
Abstract: Intron removal requires assembly of the spliceosome on precursor mRNA (pre-mRNA) and extensive remodelling to form the spliceosome's catalytic centre. Here we report the cryo-electron microscopy ...Intron removal requires assembly of the spliceosome on precursor mRNA (pre-mRNA) and extensive remodelling to form the spliceosome's catalytic centre. Here we report the cryo-electron microscopy structure of the yeast Saccharomyces cerevisiae pre-catalytic B complex spliceosome at near-atomic resolution. The mobile U2 small nuclear ribonucleoprotein particle (snRNP) associates with U4/U6.U5 tri-snRNP through the U2/U6 helix II and an interface between U4/U6 di-snRNP and the U2 snRNP SF3b-containing domain, which also transiently contacts the helicase Brr2. The 3' region of the U2 snRNP is flexibly attached to the SF3b-containing domain and protrudes over the concave surface of tri-snRNP, where the U1 snRNP may reside before its release from the pre-mRNA 5' splice site. The U6 ACAGAGA sequence forms a hairpin that weakly tethers the 5' splice site. The B complex proteins Prp38, Snu23 and Spp381 bind the Prp8 N-terminal domain and stabilize U6 ACAGAGA stem-pre-mRNA and Brr2-U4 small nuclear RNA interactions. These results provide important insights into the events leading to active site formation.
History
DepositionApr 24, 2017-
Header (metadata) releaseMay 31, 2017-
Map releaseMay 31, 2017-
UpdateAug 30, 2017-
Current statusAug 30, 2017Processing site: PDBe / Status: Released

-
Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0181
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by radius
  • Surface level: 0.0181
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_3684.png

Downloads & links

-
Map

FileDownload / File: emd_3684.map.gz / Format: CCP4 / Size: 421.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationsharpened B3 map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.43 Å/pix.
x 480 pix.
= 686.4 Å		1.43 Å/pix.
x 480 pix.
= 686.4 Å		1.43 Å/pix.
x 480 pix.
= 686.4 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.43 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0181 / Movie #1: 0.0181
Minimum - Maximum-0.018065289 - 0.059025753
Average (Standard dev.)-0.00032612772 (±0.001239301)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions480480480
Spacing480480480
CellA=B=C: 686.39996 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.431.431.43
M x/y/z480480480
origin x/y/z0.0000.0000.000
length x/y/z686.400686.400686.400
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS480480480
D min/max/mean-0.0180.059-0.000

-
Supplemental data

-
Sample components

-
Entire : Pre-catalytic B complex Spliceosome

EntireName: Pre-catalytic B complex Spliceosome
Components
  • Complex: Pre-catalytic B complex Spliceosome

-
Supramolecule #1: Pre-catalytic B complex Spliceosome

SupramoleculeName: Pre-catalytic B complex Spliceosome / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast) / Strain: BCY123
Molecular weightExperimental: 2.5 MDa

-
Experimental details

-
Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

-
Sample preparation

Concentration1.5 mg/mL
BufferpH: 7.9
Component:
ConcentrationFormula
20.0 mMHEPES
50.0 mMKCl
0.2 mMEDTA
1.0 mMDTT
2.5 mMDesthiobiotin

Details: Buffer pH: HEPES, 7.9; EDTA, 8.0
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK III
Details: Grids were glow-discharged for 15 s before deposition of 3 microliter sample (~1.5 mg mL-1), and subsequently incubated for 2-3.5 s before blotting and vitrification by plunging into liquid ...Details: Grids were glow-discharged for 15 s before deposition of 3 microliter sample (~1.5 mg mL-1), and subsequently incubated for 2-3.5 s before blotting and vitrification by plunging into liquid ethane with a Vitrobot Mark III (FEI) operated at 4 degrees Celsius and 100% humidity..

-
Electron microscopy

MicroscopeFEI TITAN KRIOS
Specialist opticsEnergy filter - Name: GIF Quantum
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Dimensions - Width: 3710 pixel / Digitization - Dimensions - Height: 3838 pixel / Digitization - Sampling interval: 5.0 µm / Digitization - Frames/image: 1-20 / Number real images: 5115 / Average exposure time: 16.0 sec. / Average electron dose: 56.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated defocus max: 5.3 µm / Calibrated defocus min: 0.35 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal magnification: 81000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

+
Image processing

DetailsMovies were binned once and aligned using MOTIONCORR.
Particle selectionNumber selected: 496581
CTF correctionSoftware:
Namedetails
CTFFIND (ver. 4.1)CTF determination
RELION (ver. 2.0)CTF correction
Startup modelType of model: OTHER
Details: The negative stain map of human B-delta-U1 (EMD-1066) was used as an initial reference for three-dimensional refinement of a 12229 particle negative stain data set of the yeast B complex. A ...Details: The negative stain map of human B-delta-U1 (EMD-1066) was used as an initial reference for three-dimensional refinement of a 12229 particle negative stain data set of the yeast B complex. A single round of 3D classification revealed a B complex density from 3707 particles that was refined to an estimated resolution of 50 A. This density was low-pass filtered to 60 A and used for processing of cryo-EM data.
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 17.2 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 2.0)
Details: A temperature factor of -200 A2 was applied (sharpened B2 map).
Number images used: 79166
Initial angle assignmentType: PROJECTION MATCHING / Software - Name: RELION (ver. 2.0)
Final angle assignmentType: PROJECTION MATCHING / Software - Name: RELION (ver. 2.0)
Final 3D classificationSoftware - Name: RELION (ver. 2.0)

-
Atomic model buiding 1

RefinementSpace: REAL / Overall B value: 200

+
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