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- EMDB-5876: Single-particle reconstruction of conformation XVI of ligand-free sGC -

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Basic information

Database: EMDB / ID: EMD-5876
TitleSingle-particle reconstruction of conformation XVI of ligand-free sGC
Map data
SampleSoluble Guanylate Cyclase, ligand-freeSoluble guanylyl cyclase
  • Soluble Guanylate CyclaseSoluble guanylyl cyclase
Keywordssoluble guanylate cyclase / conformational heterogeneity
Biological speciesRattus norvegicus (Norway rat)
Methodsingle particle reconstruction / negative staining / Resolution: 30 Å
AuthorsCampbell MG / Underbakke ES / Potter CS / Carragher B / Marletta MA
CitationJournal: Proc Natl Acad Sci U S A / Year: 2014
Title: Single-particle EM reveals the higher-order domain architecture of soluble guanylate cyclase.
Authors: Melody G Campbell / Eric S Underbakke / Clinton S Potter / Bridget Carragher / Michael A Marletta /
Abstract: Soluble guanylate cyclase (sGC) is the primary nitric oxide (NO) receptor in mammals and a central component of the NO-signaling pathway. The NO-signaling pathways mediate diverse physiological ...Soluble guanylate cyclase (sGC) is the primary nitric oxide (NO) receptor in mammals and a central component of the NO-signaling pathway. The NO-signaling pathways mediate diverse physiological processes, including vasodilation, neurotransmission, and myocardial functions. sGC is a heterodimer assembled from two homologous subunits, each comprised of four domains. Although crystal structures of isolated domains have been reported, no structure is available for full-length sGC. We used single-particle electron microscopy to obtain the structure of the complete sGC heterodimer and determine its higher-order domain architecture. Overall, the protein is formed of two rigid modules: the catalytic dimer and the clustered Per/Art/Sim and heme-NO/O2-binding domains, connected by a parallel coiled coil at two hinge points. The quaternary assembly demonstrates a very high degree of flexibility. We captured hundreds of individual conformational snapshots of free sGC, NO-bound sGC, and guanosine-5'-[(α,β)-methylene]triphosphate-bound sGC. The molecular architecture and pronounced flexibility observed provides a significant step forward in understanding the mechanism of NO signaling.
DepositionJan 17, 2014-
Header (metadata) releaseMar 19, 2014-
Map releaseMar 19, 2014-
UpdateMar 19, 2014-
Current statusMar 19, 2014Processing site: RCSB / Status: Released

Structure visualization

  • Surface view with section colored by density value
  • Surface level: 0.975
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.975
  • Imaged by UCSF Chimera
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Structure viewerEM map:
Supplemental images

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FileDownload / File: emd_5876.map.gz / Format: CCP4 / Size: 41.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 224 pix.
= 237.44 Å
1.06 Å/pix.
x 224 pix.
= 237.44 Å
1.06 Å/pix.
x 224 pix.
= 237.44 Å



Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.06 Å
Contour LevelBy AUTHOR: 0.975 / Movie #1: 0.975
Minimum - Maximum-1.03682029 - 3.08632421
Average (Standard dev.)-0.0024053 (±0.24192426)
SymmetrySpace group: 1


Map geometry
Axis orderXYZ
CellA=B=C: 237.43999 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.061.061.06
M x/y/z224224224
origin x/y/z0.0000.0000.000
length x/y/z237.440237.440237.440
start NX/NY/NZ-95-75153
MAP C/R/S123
start NC/NR/NS-112-112-112
D min/max/mean-1.0373.086-0.002

Supplemental data

Sample components

Entire Soluble Guanylate Cyclase, ligand-free

EntireName: Soluble Guanylate Cyclase, ligand-freeSoluble guanylyl cyclase
Number of Components: 1 / Oligomeric State: Heterodimer
MassTheoretical: 150 kDa / Experimental: 150 kDa

Component #1: protein, Soluble Guanylate Cyclase

ProteinName: Soluble Guanylate CyclaseSoluble guanylyl cyclase / a.k.a: sGC / Oligomeric Details: Heterodimer / Recombinant expression: Yes / Number of Copies: 1
MassTheoretical: 150 kDa / Experimental: 150 kDa
SourceSpecies: Rattus norvegicus (Norway rat)
Source (engineered)Expression System: Spodoptera frugiperda (fall armyworm) / Vector: pFastBac1/sGCALPHA1 and pFastBac1/sGCBETA1 / Cell of expression system: Sf9

Experimental details

Sample preparation

SpecimenSpecimen State: Particle / Method: negative staining
Sample solutionBuffer solution: 50 mM TEA, 150 mM NaCl, 5 mM DTT / pH: 7.5
Support filmGlow discharged C-flat grid with 2-micron-diameter holes overlaid by thin 1.5 nm continuous carbon
Staining3 microliters of sample were applied to grid. The specimen was stained twice with 2% uranyl formate, then allowed to air-dry.
VitrificationCryogen Name: NONE

Electron microscopy imaging

Experimental equipment
Model: Tecnai F20 / Image courtesy: FEI Company
ImagingMicroscope: FEI TECNAI F20 / Date: Jan 26, 2013
Electron gunElectron Source: FIELD EMISSION GUN / Accelerating Voltage: 200 kV / Electron Dose: 35 e/Å2 / Illumination Mode: FLOOD BEAM
LensMagnification: 80000 X (nominal) / Cs: 2 mm / Imaging Mode: BRIGHT FIELD / Defocus: 1200 - 2200 nm
Specimen HolderModel: SIDE ENTRY, EUCENTRIC / Tilt Angle: -55 - 0 ° / Temperature: 298
CameraDetector: TVIPS TEMCAM-F416 (4k x 4k)

Image acquisition

Image acquisitionNumber of Digital Images: 2204

Image processing

ProcessingMethod: single particle reconstruction / Number of Class Averages: 1 / Applied Symmetry: C1 (asymmetric) / Number of Projections: 280 / Details: See publication
3D reconstructionAlgorithm: RCT / Software: SPIDER / CTF correction: Each micrograph / Resolution: 30 Å / Resolution Method: FSC 0.5, semi-independent

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