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- PDB-7vdc: 3.28 A structure of the rabbit muscle aldolase -

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Basic information

Database: PDB / ID: 7vdc
Title3.28 A structure of the rabbit muscle aldolase
ComponentsFructose-bisphosphate aldolase A
KeywordsSTRUCTURAL PROTEIN / Rabbit muscle aldolase
Function / homology
Function and homology information

negative regulation of Arp2/3 complex-mediated actin nucleation / fructose-bisphosphate aldolase / fructose-bisphosphate aldolase activity / M band / I band / glycolytic process / protein homotetramerization / positive regulation of cell migration
Similarity search - Function
Fructose-bisphosphate aldolase class-I active site. / Fructose-bisphosphate aldolase class-I active site / Fructose-bisphosphate aldolase, class-I / Fructose-bisphosphate aldolase class-I / Aldolase-type TIM barrel
Similarity search - Domain/homology
Fructose-bisphosphate aldolase A
Similarity search - Component
Biological speciesOryctolagus cuniculus (rabbit)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.28 Å
AuthorsFan, H.C. / Zhang, Y. / Sun, F.
Funding support China, 5items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)2017YFA0504700 China
National Natural Science Foundation of China (NSFC)31830020 China
Chinese Academy of SciencesXDB37040102 China
National Natural Science Foundation of China (NSFC)31925026 China
Ministry of Science and Technology (MoST, China)2015DFG32140 China
CitationJournal: Nat Commun / Year: 2021
Title: A cryo-electron microscopy support film formed by 2D crystals of hydrophobin HFBI.
Authors: Hongcheng Fan / Bo Wang / Yan Zhang / Yun Zhu / Bo Song / Haijin Xu / Yujia Zhai / Mingqiang Qiao / Fei Sun /
Abstract: Cryo-electron microscopy (cryo-EM) has become a powerful tool to resolve high-resolution structures of biomacromolecules in solution. However, air-water interface induced preferred orientations, ...Cryo-electron microscopy (cryo-EM) has become a powerful tool to resolve high-resolution structures of biomacromolecules in solution. However, air-water interface induced preferred orientations, dissociation or denaturation of biomacromolecules during cryo-vitrification remains a limiting factor for many specimens. To solve this bottleneck, we developed a cryo-EM support film using 2D crystals of hydrophobin HFBI. The hydrophilic side of the HFBI film adsorbs protein particles via electrostatic interactions and sequesters them from the air-water interface, allowing the formation of sufficiently thin ice for high-quality data collection. The particle orientation distribution can be regulated by adjusting the buffer pH. Using this support, we determined the cryo-EM structures of catalase (2.29 Å) and influenza haemagglutinin trimer (2.56 Å), which exhibited strong preferred orientations using a conventional cryo-vitrification protocol. We further show that the HFBI film is suitable to obtain high-resolution structures of small proteins, including aldolase (150 kDa, 3.28 Å) and haemoglobin (64 kDa, 3.6 Å). Our work suggests that HFBI films may have broad future applications in increasing the success rate and efficiency of cryo-EM.
DepositionSep 6, 2021Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Dec 29, 2021Provider: repository / Type: Initial release

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Deposited unit
A: Fructose-bisphosphate aldolase A
B: Fructose-bisphosphate aldolase A
C: Fructose-bisphosphate aldolase A
D: Fructose-bisphosphate aldolase A

Theoretical massNumber of molelcules
Total (without water)157,5804

  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area8960 Å2
ΔGint-42 kcal/mol
Surface area52380 Å2


#1: Protein
Fructose-bisphosphate aldolase A / Muscle-type aldolase

Mass: 39394.875 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Source: (natural) Oryctolagus cuniculus (rabbit) / References: UniProt: P00883, fructose-bisphosphate aldolase

Experimental details


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

Sample preparation

ComponentName: Rabbit muscle aldolase / Type: COMPLEX / Entity ID: all / Source: NATURAL
Molecular weightValue: 0.15 MDa / Experimental value: NO
Source (natural)Organism: Oryctolagus cuniculus (rabbit)
Source (recombinant)Organism: Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)
Buffer solutionpH: 7.5
Buffer component
120 mMHEPES1
250 mMNaClSodium chloride1
SpecimenConc.: 1.2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: NICKEL/TITANIUM / Grid mesh size: 300 divisions/in.
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen 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 FIELDBright-field microscopy / Nominal magnification: 215000 X
Image recordingElectron dose: 70 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Num. of real images: 2460
Image scansMovie frames/image: 40


SoftwareName: PHENIX / Version: 1.19_4092: / Classification: refinement
EM software
1Topazparticle selection
2SerialEMimage acquisition
4Gctf1.06CTF correction
10RELION3.1initial Euler assignment
11RELION3.1final Euler assignment
13RELION3.13D reconstruction
Particle selectionNum. of particles selected: 769925
SymmetryPoint symmetry: D2 (2x2 fold dihedral)
3D reconstructionResolution: 3.28 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 228832 / Algorithm: FOURIER SPACE / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00210676
ELECTRON MICROSCOPYf_angle_d0.50614472
ELECTRON MICROSCOPYf_dihedral_angle_d3.6731476
ELECTRON MICROSCOPYf_chiral_restr0.041644
ELECTRON MICROSCOPYf_plane_restr0.0051884

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