7KNH

Cryo-EM Structure of Double ACE2-Bound SARS-CoV-2 Trimer Spike at pH 5.5


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.74 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Cryo-EM Structures of SARS-CoV-2 Spike without and with ACE2 Reveal a pH-Dependent Switch to Mediate Endosomal Positioning of Receptor-Binding Domains.

Zhou, T.Tsybovsky, Y.Gorman, J.Rapp, M.Cerutti, G.Chuang, G.Y.Katsamba, P.S.Sampson, J.M.Schon, A.Bimela, J.Boyington, J.C.Nazzari, A.Olia, A.S.Shi, W.Sastry, M.Stephens, T.Stuckey, J.Teng, I.T.Wang, P.Wang, S.Zhang, B.Friesner, R.A.Ho, D.D.Mascola, J.R.Shapiro, L.Kwong, P.D.

(2020) Cell Host Microbe 28: 867

  • DOI: 10.1016/j.chom.2020.11.004
  • Primary Citation of Related Structures:  
    7KMS, 7KMB, 7KNE, 7KNB, 7KNH, 7KNI, 7KMZ

  • PubMed Abstract: 
  • The SARS-CoV-2 spike employs mobile receptor-binding domains (RBDs) to engage the human ACE2 receptor and to facilitate virus entry, which can occur through low-pH-endosomal pathways. To understand how ACE2 binding and low pH affect spike conformation, we determined cryo-electron microscopy structures-at serological and endosomal pH-delineating spike recognition of up to three ACE2 molecules ...

    The SARS-CoV-2 spike employs mobile receptor-binding domains (RBDs) to engage the human ACE2 receptor and to facilitate virus entry, which can occur through low-pH-endosomal pathways. To understand how ACE2 binding and low pH affect spike conformation, we determined cryo-electron microscopy structures-at serological and endosomal pH-delineating spike recognition of up to three ACE2 molecules. RBDs freely adopted "up" conformations required for ACE2 interaction, primarily through RBD movement combined with smaller alterations in neighboring domains. In the absence of ACE2, single-RBD-up conformations dominated at pH 5.5, resolving into a solitary all-down conformation at lower pH. Notably, a pH-dependent refolding region (residues 824-858) at the spike-interdomain interface displayed dramatic structural rearrangements and mediated RBD positioning through coordinated movements of the entire trimer apex. These structures provide a foundation for understanding prefusion-spike mechanics governing endosomal entry; we suggest that the low pH all-down conformation potentially facilitates immune evasion from RBD-up binding antibody.


    Organizational Affiliation

    Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA; Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA. Electronic address: pdkwong@nih.gov.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Spike glycoproteinB [auth A], D [auth B], A [auth C]1288Severe acute respiratory syndrome coronavirus 2Mutation(s): 5 
Gene Names: S2
Membrane Entity: Yes 
UniProt
Find proteins for P0DTC2 (Severe acute respiratory syndrome coronavirus 2)
Explore P0DTC2 
Go to UniProtKB:  P0DTC2
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Angiotensin-converting enzyme 2E [auth D], C [auth E]597Homo sapiensMutation(s): 0 
Gene Names: ACE2UNQ868/PRO1885
EC: 3.4.17.23 (PDB Primary Data), 3.4.17 (PDB Primary Data)
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BYF1 (Homo sapiens)
Explore Q9BYF1 
Go to UniProtKB:  Q9BYF1
PHAROS:  Q9BYF1
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 3
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseF, G, H, I2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG (Subject of Investigation/LOI)
Query on NAG

Download Ideal Coordinates CCD File 
AA [auth A] , AB [auth B] , BA [auth A] , BB [auth D] , CA [auth A] , CB [auth D] , DA [auth A] , DB [auth D] , 
AA [auth A],  AB [auth B],  BA [auth A],  BB [auth D],  CA [auth A],  CB [auth D],  DA [auth A],  DB [auth D],  EA [auth A],  EB [auth D],  FA [auth A],  GA [auth A],  HA [auth A],  IA [auth A],  J [auth C],  JA [auth A],  K [auth C],  KA [auth E],  L [auth C],  LA [auth E],  M [auth C],  MA [auth E],  N [auth C],  NA [auth B],  O [auth C],  OA [auth B],  P [auth C],  PA [auth B],  Q [auth C],  QA [auth B],  R [auth C],  RA [auth B],  S [auth C],  SA [auth B],  T [auth C],  TA [auth B],  U [auth C],  UA [auth B],  V [auth C],  VA [auth B],  W [auth A],  WA [auth B],  X [auth A],  XA [auth B],  Y [auth A],  YA [auth B],  Z [auth A],  ZA [auth B]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.74 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesU24 GM129539
Other privateUnited StatesSF349247

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-16
    Type: Initial release
  • Version 1.1: 2020-12-23
    Changes: Database references
  • Version 1.2: 2021-01-27
    Changes: Structure summary