Lederhausens Center for CF Research at University Gothenburg
Sweden
Center for Innovative Medicine (KI)
Sweden
Cystic Fibrosis Foundation
14X0
United States
Swedish CF Foundation
Sweden
Cystic Fibrosis Foundation
077X0
United States
Swedish Research Council
Sweden
The Knut and Alice Wallenberg Foundation
Sweden
The Swedish Cancer Foundation
Sweden
Sahlgrenska University Hospital (ALF)
Sweden
IngaBritt and Arne Lundberg Foundation
Sweden
National Institute of Allergy and Infectious Diseases
U01AI095473
Sweden
Wilhelm and Martina Lundgrens Foundation
Sweden
Erica Lederhausens Foundation
Sweden
The Swedish Foundation for Strategic Research
Sweden
Citation
Journal: J Biol Chem / Year: 2018 Title: Granule-stored MUC5B mucins are packed by the non-covalent formation of N-terminal head-to-head tetramers. Authors: Sergio Trillo-Muyo / Harriet E Nilsson / Christian V Recktenwald / Anna Ermund / Caroline Ridley / Lauren N Meiss / Andrea Bähr / Nikolai Klymiuk / Jeffrey J Wine / Philip J B Koeck / David ...Authors: Sergio Trillo-Muyo / Harriet E Nilsson / Christian V Recktenwald / Anna Ermund / Caroline Ridley / Lauren N Meiss / Andrea Bähr / Nikolai Klymiuk / Jeffrey J Wine / Philip J B Koeck / David J Thornton / Hans Hebert / Gunnar C Hansson / Abstract: Most MUC5B mucin polymers in the upper airways of humans and pigs are produced by submucosal glands. MUC5B forms N-terminal covalent dimers that are further packed into larger assemblies because of ...Most MUC5B mucin polymers in the upper airways of humans and pigs are produced by submucosal glands. MUC5B forms N-terminal covalent dimers that are further packed into larger assemblies because of low pH and high Ca in the secretory granule of the mucin-producing cell. We purified the recombinant MUC5B N-terminal covalent dimer and used single-particle electron microscopy to study its structure under intracellular conditions. We found that, at intragranular pH, the dimeric MUC5B organized into head-to-head noncovalent tetramers where the von Willebrand D1-D2 domains hooked into each other. These N-terminal tetramers further formed long linear complexes from which, we suggest, the mucin domains and their C termini project radially outwards. Using conventional and video microscopy, we observed that, upon secretion into the submucosal gland ducts, a flow of bicarbonate-rich fluid passes the mucin-secreting cells. We suggest that this unfolds and pulls out the MUC5B assemblies into long linear threads. These further assemble into thicker mucin bundles in the glandular ducts before emerging at the gland duct opening. We conclude that the combination of intracellular packing of the MUC5B mucin and the submucosal gland morphology creates an efficient machine for producing linear mucin bundles.
History
Deposition
Feb 13, 2018
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Header (metadata) release
Feb 21, 2018
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Map release
Mar 20, 2019
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Update
Oct 2, 2019
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Current status
Oct 2, 2019
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Download / File: emd_4296.map.gz / Format: CCP4 / Size: 27 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotation
None
Voxel size
X=Y=Z: 2.0785 Å
Density
Contour Level
By AUTHOR: 1.14 / Movie #1: 1.14
Minimum - Maximum
-0.92020476 - 3.0594723
Average (Standard dev.)
0.009275456 (±0.13923985)
Symmetry
Space group: 1
Details
EMDB XML:
Map geometry
Axis order
X
Y
Z
Origin
-96
-96
-96
Dimensions
192
192
192
Spacing
192
192
192
Cell
A=B=C: 399.07202 Å α=β=γ: 90.0 °
CCP4 map header:
mode
Image stored as Reals
Å/pix. X/Y/Z
2.0785
2.0785
2.0785
M x/y/z
192
192
192
origin x/y/z
0.000
0.000
0.000
length x/y/z
399.072
399.072
399.072
α/β/γ
90.000
90.000
90.000
start NX/NY/NZ
0
0
0
NX/NY/NZ
320
320
320
MAP C/R/S
1
2
3
start NC/NR/NS
-96
-96
-96
NC/NR/NS
192
192
192
D min/max/mean
-0.920
3.059
0.009
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Supplemental data
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Sample components
-
Entire : MUC5B N-terminal oligomeric state
Entire
Name: MUC5B N-terminal oligomeric state
Components
Complex: MUC5B N-terminal oligomeric state
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Supramolecule #1: MUC5B N-terminal oligomeric state
Supramolecule
Name: MUC5B N-terminal oligomeric state / type: complex / ID: 1 / Parent: 0 Details: The MUC5B N-terminal covalent dimers form non-covalent tetramers at low pH, high Ca2+ in the secretory vesicles of the mucus secreting cells
Source (natural)
Organism: Homo sapiens (human) / Strain: Human / Organ: submucosal gland / Tissue: gland
Number selected: 4456 Details: Negative monitor contrast fascilated particle picking
CTF correction
Software - Name: EMAN2 (ver. 2.12) Software - details: EMAN2 e2boxer.py was used to automatically select particle images Details: For low resolution data EMAN2 uses a 1D structure factor during the CTF procedure
Startup model
Type of model: OTHER Details: The initial model was based on a subset of class averages representing different views.
Final reconstruction
Applied symmetry - Point group: D2 (2x2 fold dihedral) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 25.5 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: EMAN2 (ver. 2.12) / Number images used: 4056
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