8CT2

Local refinement of AQP1 tetramer (C1; refinement mask included D1 of protein 4.2 and Ankyrin-1 AR1-5) in Class 2 of erythrocyte ankyrin-1 complex

• PDB DOI: https://doi.org/10.2210/pdb8CT2/pdb
• EM Map EMD-26978: EMDB EMDataResource

• Classification: TRANSPORT PROTEIN/STRUCTURAL PROTEIN
• Organism(s): Homo sapiens
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMmpstruc


• Deposited: 2022-05-13 Released: 2022-07-20 
• Deposition Author(s): Vallese, F., Kim, K., Yen, L.Y., Johnston, J.D., Noble, A.J., Cali, T., Clarke, O.B.
• Funding Organization(s): Not funded

---

Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.10 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Architecture of the human erythrocyte ankyrin-1 complex.

Vallese, F., Kim, K., Yen, L.Y., Johnston, J.D., Noble, A.J., Cali, T., Clarke, O.B.

(2022) Nat Struct Mol Biol 29: 706-718

• PubMed: 35835865 
• DOI: https://doi.org/10.1038/s41594-022-00792-w
• Primary Citation of Related Structures:  
  7UZ3, 7UZE, 7UZQ, 7UZS, 7UZU, 7UZV, 7V07, 7V0K, 7V0M, 7V0Q, 7V0S, 7V0T, 7V0U, 7V0X, 7V0Y, 7V19, 8CRQ, 8CRR, 8CRT, 8CS9, 8CSL, 8CSV, 8CSW, 8CSX, 8CSY, 8CT2, 8CT3, 8CTE


• PubMed Abstract: 
  

  The stability and shape of the erythrocyte membrane is provided by the ankyrin-1 complex, but how it tethers the spectrin-actin cytoskeleton to the lipid bilayer and the nature of its association with the band 3 anion exchanger and the Rhesus glycoproteins remains unknown. Here we present structures of ankyrin-1 complexes purified from human erythrocytes. We reveal the architecture of a core complex of ankyrin-1, the Rhesus proteins RhAG and RhCE, the band 3 anion exchanger, protein 4.2, glycophorin A and glycophorin B. The distinct T-shaped conformation of membrane-bound ankyrin-1 facilitates recognition of RhCE and, unexpectedly, the water channel aquaporin-1. Together, our results uncover the molecular details of ankyrin-1 association with the erythrocyte membrane, and illustrate the mechanism of ankyrin-mediated membrane protein clustering.

---

Organizational Affiliation: 

Department of Anesthesiology, Columbia University Irving Medical Center, New York, NY, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C4  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 116.7 kDa 
• Atom Count: 7,464 
• Modelled Residue Count: 988 
• Deposited Residue Count: 1,076 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Aquaporin-1	A [auth D], B, C, D [auth A]	269	Homo sapiens	Mutation(s): 0  Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P29972 (Homo sapiens) Explore P29972  Go to UniProtKB:  P29972
PHAROS:  P29972 GTEx:  ENSG00000240583

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CLR	E [auth D], F [auth D], G [auth A], H [auth A]	CHOLESTEROL C27 H46 O HVYWMOMLDIMFJA-DPAQBDIFSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
P1L	A [auth D], B, C, D [auth A]	L-PEPTIDE LINKING	C19 H37 N O3 S		CYS

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.10 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2022-07-20 
Deposition Author(s): Vallese, F., Kim, K., Yen, L.Y., Johnston, J.D., Noble, A.J., Cali, T., Clarke, O.B.

---

Funding Organization	Location	Grant Number
Not funded		--

Revision History  

• Version 1.0: 2022-07-20
  Type: Initial release
  
• Version 1.1: 2022-07-27
  Changes: Database references