7ZW1 | pdb_00007zw1

Human PRPH2-ROM1 hetero-dimer

• PDB DOI: https://doi.org/10.2210/pdb7ZW1/pdb
• EM Map EMD-14991: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens, Lama
• Expression System: Homo sapiens, Escherichia coli
• Mutation(s): Yes 
• Membrane Protein: Yes  OPMPDBTMmpstruc


• Deposited: 2022-05-17 Released: 2022-11-16 
• Deposition Author(s): El Mazouni, D., Gros, P.
• Funding Organization(s): European Research Council (ERC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.70 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Cryo-EM structures of peripherin-2 and ROM1 suggest multiple roles in photoreceptor membrane morphogenesis.

El Mazouni, D., Gros, P.

(2022) Sci Adv 8: eadd3677-eadd3677

• PubMed: 36351012 
• DOI: https://doi.org/10.1126/sciadv.add3677
• Primary Citation Related Structures: 
  7ZW1


• PubMed Abstract: 
  

  Mammalian peripherin-2 (PRPH2) and rod outer segment membrane protein 1 (ROM1) are retina-specific tetraspanins that partake in the constant renewal of stacked membrane discs of photoreceptor cells that enable vision. Here, we present single-particle cryo-electron microscopy structures of solubilized PRPH2-ROM1 heterodimers and higher-order oligomers. High-risk PRPH2 and ROM1 mutations causing blindness map to the protein-dimer interface. Cysteine bridges connect dimers forming positive-curved oligomers, whereas negative-curved oligomers were observed occasionally. Hexamers and octamers exhibit a secondary micelle that envelopes four carboxyl-terminal helices, supporting a potential role in membrane remodeling. Together, the data indicate multiple structures for PRPH2-ROM1 in creating and maintaining compartmentalization of photoreceptor cells.

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Organizational Affiliation: 
• Structural Biochemistry, Bijvoet Centre for Biomolecular Research, Department of Chemistry, Faculty of Science, Utrecht University, Netherlands.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 3-mer - A2B1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 91.95 kDa 
• Atom Count: 5,924 
• Modeled Residue Count: 760 
• Deposited Residue Count: 837 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Peripherin-2	A	353	Homo sapiens	Mutation(s): 1  Gene Names: PRPH2, PRPH, RDS, TSPAN22 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P23942 (Homo sapiens) Explore P23942  Go to UniProtKB:  P23942
PHAROS:  P23942 GTEx:  ENSG00000112619

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Rod outer segment membrane protein 1	B	352	Homo sapiens	Mutation(s): 0  Gene Names: ROM1, TSPAN23 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for Q03395 (Homo sapiens) Explore Q03395  Go to UniProtKB:  Q03395
PHAROS:  Q03395 GTEx:  ENSG00000149489

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Nanobody	C	132	Lama	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.70 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2022-11-16 
Deposition Author(s): El Mazouni, D., Gros, P.

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Funding Organization	Location	Grant Number
European Research Council (ERC)	European Union	BC.000795.1

Revision History  

• Version 1.0: 2022-11-16
  Type: Initial release
  
• Version 1.1: 2024-11-13
  Changes: Data collection, Structure summary
• Version 1.2: 2025-07-02
  Changes: Data collection