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- EMDB-28711: CryoEM reconstruction of membrane-bound, left-handed CHMP1B+IST1 ... -

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Basic information

Entry
Database: EMDB / ID: EMD-28711
TitleCryoEM reconstruction of membrane-bound, left-handed CHMP1B+IST1 filament with 30% cholesterol
Map dataLeft-handed, 17-subunit-per-turn, membrane-bound CHMP1B/IST1 with 30% cholesterol.Handedness
Sample
  • Complex: membrane-bound, left-handed CHMP1B+IST1 filament with 30% cholesterolBiological membrane
    • Protein or peptide: CHMP1B
    • Protein or peptide: IST1
KeywordsESCRT / brominated / lipid / membrane / MEMBRANE PROTEIN
Function / homology
Function and homology information


viral capsid secondary envelopment / MIT domain binding / abscission / amphisome membrane / multivesicular body-lysosome fusion / vesicle fusion with vacuole / ESCRT III complex disassembly / late endosome to lysosome transport / ESCRT III complex / endosome transport via multivesicular body sorting pathway ...viral capsid secondary envelopment / MIT domain binding / abscission / amphisome membrane / multivesicular body-lysosome fusion / vesicle fusion with vacuole / ESCRT III complex disassembly / late endosome to lysosome transport / ESCRT III complex / endosome transport via multivesicular body sorting pathway / kinetochore microtubule / cytoskeleton-dependent cytokinesis / collateral sprouting / regulation of centrosome duplication / Sealing of the nuclear envelope (NE) by ESCRT-III / nuclear membrane reassembly / multivesicular body sorting pathway / positive regulation of collateral sprouting / midbody abscission / membrane coat / membrane fission / plasma membrane repair / late endosome to vacuole transport / multivesicular body membrane / ubiquitin-dependent protein catabolic process via the multivesicular body sorting pathway / multivesicular body assembly / regulation of mitotic spindle assembly / Flemming body / nucleus organization / mitotic metaphase chromosome alignment / viral budding via host ESCRT complex / autophagosome maturation / autophagosome membrane / positive regulation of proteolysis / endoplasmic reticulum-Golgi intermediate compartment / viral release from host cell / nuclear pore / multivesicular body / viral budding from plasma membrane / establishment of protein localization / protein localization / kinetochore / autophagy / azurophil granule lumen / protein transport / nuclear envelope / midbody / endosome membrane / cadherin binding / lysosomal membrane / protein domain specific binding / cell division / intracellular membrane-bounded organelle / centrosome / chromatin / Neutrophil degranulation / protein-containing complex binding / extracellular exosome / extracellular region / nucleoplasm / identical protein binding / plasma membrane / cytosol
Similarity search - Function
Vacuolar protein sorting-associated protein Ist1 / Regulator of Vps4 activity in the MVB pathway / Vacuolar protein sorting-associated protein IST1-like / Snf7 family / Snf7
Similarity search - Domain/homology
IST1 homolog / Charged multivesicular body protein 1b
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodhelical reconstruction / cryo EM / Resolution: 4.4 Å
AuthorsMoss FR / Frost A
Funding support United States, 7 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM117593 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM137109 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM082545 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM110772 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM089740 United States
Howard Hughes Medical Institute (HHMI) United States
Chan Zuckerberg Initiative United States
CitationJournal: Nat Struct Mol Biol / Year: 2020
Title: Membrane constriction and thinning by sequential ESCRT-III polymerization.
Authors: Henry C Nguyen / Nathaniel Talledge / John McCullough / Abhimanyu Sharma / Frank R Moss / Janet H Iwasa / Michael D Vershinin / Wesley I Sundquist / Adam Frost /
Abstract: The endosomal sorting complexes required for transport (ESCRTs) mediate diverse membrane remodeling events. These typically require ESCRT-III proteins to stabilize negatively curved membranes; ...The endosomal sorting complexes required for transport (ESCRTs) mediate diverse membrane remodeling events. These typically require ESCRT-III proteins to stabilize negatively curved membranes; however, recent work has indicated that certain ESCRT-IIIs also participate in positive-curvature membrane-shaping reactions. ESCRT-IIIs polymerize into membrane-binding filaments, but the structural basis for negative versus positive membrane remodeling by these proteins remains poorly understood. To learn how certain ESCRT-IIIs shape positively curved membranes, we determined structures of human membrane-bound CHMP1B-only, membrane-bound CHMP1B + IST1, and IST1-only filaments by cryo-EM. Our structures show how CHMP1B first polymerizes into a single-stranded helical filament, shaping membranes into moderate-curvature tubules. Subsequently, IST1 assembles a second strand on CHMP1B, further constricting the membrane tube and reducing its diameter nearly to the fission point. Each step of constriction thins the underlying bilayer, lowering the barrier to membrane fission. Our structures reveal how a two-component, sequential polymerization mechanism drives membrane tubulation, constriction and bilayer thinning.
History
DepositionOct 28, 2022-
Header (metadata) releaseJan 11, 2023-
Map releaseJan 11, 2023-
UpdateJan 17, 2024-
Current statusJan 17, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

Downloads & links

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Map

FileDownload / File: emd_28711.map.gz / Format: CCP4 / Size: 184 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationLeft-handed, 17-subunit-per-turn, membrane-bound CHMP1B/IST1 with 30% cholesterol.
Voxel sizeX=Y=Z: 1.14 Å
Density
Contour LevelBy AUTHOR: 0.005
Minimum - Maximum-0.012868625 - 0.020567255
Average (Standard dev.)0.00010303522 (±0.0017694724)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions364364364
Spacing364364364
CellA=B=C: 414.96 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_28711_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

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Additional map: RELION post-processed, left-handed, 17-subunit-per-turn, membrane-bound CHMP1B/IST1 with 30%...

Fileemd_28711_additional_1.map
AnnotationRELION post-processed, left-handed, 17-subunit-per-turn, membrane-bound CHMP1B/IST1 with 30% cholesterol.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

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Half map: Left-handed, 17-subunit-per-turn, membrane-bound CHMP1B/IST1 with 30% cholesterol. Half...

Fileemd_28711_half_map_1.map
AnnotationLeft-handed, 17-subunit-per-turn, membrane-bound CHMP1B/IST1 with 30% cholesterol. Half 1.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

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Half map: Left-handed, 17-subunit-per-turn, membrane-bound CHMP1B/IST1 with 30% cholesterol. Half...

Fileemd_28711_half_map_2.map
AnnotationLeft-handed, 17-subunit-per-turn, membrane-bound CHMP1B/IST1 with 30% cholesterol. Half 2.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

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Sample components

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Entire : membrane-bound, left-handed CHMP1B+IST1 filament with 30% cholesterol

EntireName: membrane-bound, left-handed CHMP1B+IST1 filament with 30% cholesterolBiological membrane
Components
  • Complex: membrane-bound, left-handed CHMP1B+IST1 filament with 30% cholesterolBiological membrane
    • Protein or peptide: CHMP1B
    • Protein or peptide: IST1

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Supramolecule #1: membrane-bound, left-handed CHMP1B+IST1 filament with 30% cholesterol

SupramoleculeName: membrane-bound, left-handed CHMP1B+IST1 filament with 30% cholesterol
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: CHMP1B

MacromoleculeName: CHMP1B / type: protein_or_peptide / ID: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MSNMEKHLFN LKFAAKELSR SAKKCDKEEK AEKAKIKKAI QKGNMEVARI HAENAIRQKN QAVNFLRMSA RVDAVAARVQ TAVTMGKVTK SMAGVVKSMD ATLKTMNLEK ISALMDKFEH QFETLDVQTQ QMEDTMSSTT TLTTPQNQVD MLLQEMADEA GLDLNMELPQ ...String:
MSNMEKHLFN LKFAAKELSR SAKKCDKEEK AEKAKIKKAI QKGNMEVARI HAENAIRQKN QAVNFLRMSA RVDAVAARVQ TAVTMGKVTK SMAGVVKSMD ATLKTMNLEK ISALMDKFEH QFETLDVQTQ QMEDTMSSTT TLTTPQNQVD MLLQEMADEA GLDLNMELPQ GQTGSVGTSV ASAEQDELSQ RLARLRDQV

UniProtKB: Charged multivesicular body protein 1b

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Macromolecule #2: IST1

MacromoleculeName: IST1 / type: protein_or_peptide / ID: 2 / Details: N-terminal domain / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MLGSGFKAER LRVNLRLVIN RLKLLEKKKT ELAQKARKEI ADYLAAGKDE RARIRVEHII REDYLVEAME ILELYCDLLL ARFGLIQSMK ELDSGLAESV STLIWAAPRL QSEVAELKIV ADQLCAKYSK EYGKLCRTNQ IGTVNDRLMH KLSVEAPP

UniProtKB: IST1 homolog

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Experimental details

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Structure determination

Methodcryo EM
Processinghelical reconstruction
Aggregation statehelical array

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Sample preparation

BufferpH: 7.4
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 292 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 36000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 492 / Average electron dose: 65.0 e/Å2
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Segment selectionNumber selected: 22959 / Software - Name: crYOLO
Startup modelType of model: INSILICO MODEL / In silico model: Featureless cylinder
Final angle assignmentType: NOT APPLICABLE / Software - Name: RELION (ver. 3.0.8)
Final reconstructionApplied symmetry - Helical parameters - Δz: 3.15 Å
Applied symmetry - Helical parameters - Δ&Phi: -20.92 °
Applied symmetry - Helical parameters - Axial symmetry: C1 (asymmetric)
Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 4.4 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0.8) / Number images used: 1193
FSC plot (resolution estimation)

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