8RML

Structure of heteromeric CALHM2/4 channel in complex with synthetic nanobody SbC4

• PDB DOI: https://doi.org/10.2210/pdb8RML/pdb
• EM Map EMD-19363: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens, synthetic construct
• Expression System: Homo sapiens, Escherichia coli MC1061
• Mutation(s): No 


• Deposited: 2024-01-08 Released: 2024-06-19 
• Deposition Author(s): Drozdzyk, K., Dutzler, R.
• Funding Organization(s): Swiss National Science Foundation

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.84 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structural features of heteromeric channels composed of CALHM2 and CALHM4 paralogs

Peter, M., Drozdzyk, K., Dutzler, R.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 13-mer - A8B3C2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 13-mer - A11B2 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content

• Total Structure Weight: 430.5 kDa 
• Atom Count: 24,454 
• Modelled Residue Count: 3,088 
• Deposited Residue Count: 3,852 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Calcium homeostasis modulator protein 4	A, C [auth B], L [auth K]	322	Homo sapiens	Mutation(s): 0  Gene Names: CALHM4, C6orf78, FAM26D, UNQ6481/PRO21277
UniProt & NIH Common Fund Data Resources
Find proteins for Q5JW98 (Homo sapiens) Explore Q5JW98  Go to UniProtKB:  Q5JW98
PHAROS:  Q5JW98 GTEx:  ENSG00000164451

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Synthetic nanobody SbC4	B [auth L], M	119	synthetic construct	Mutation(s): 0

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Calcium homeostasis modulator protein 2	D [auth C], E [auth D], F [auth E], G [auth F], H [auth G], I [auth H], J [auth I], K [auth J]	331	Homo sapiens	Mutation(s): 0  Gene Names: CALHM2, FAM26B
UniProt & NIH Common Fund Data Resources
Find proteins for Q9HA72 (Homo sapiens) Explore Q9HA72  Go to UniProtKB:  Q9HA72
PHAROS:  Q9HA72 GTEx:  ENSG00000138172

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.84 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2024-06-19 
Deposition Author(s): Drozdzyk, K., Dutzler, R.

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Funding Organization	Location	Grant Number
Swiss National Science Foundation	Switzerland	--

Revision History  

• Version 1.0: 2024-06-19
  Type: Initial release