9TQB | pdb_00009tqb

Octameric C. elegans BORC, containing BORCS5, BORCS6, BORCS7, BORCS8, KXD1 and the shared BORC and BLoC-1 subunits, BLOC1S1, BLOC1S2 and Snapin

• PDB DOI: https://doi.org/10.2210/pdb9TQB/pdb
• EM Map EMD-56129: EMDB EMDataResource

• Classification: TRANSPORT PROTEIN
• Organism(s): Caenorhabditis elegans, Caenorhabditis
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2025-12-19 Released: 2026-01-21 
• Deposition Author(s): Amann, S.J., de Araujo, M.E.G., Grishkovskaya, I., Huber, L.A., Haselbach, D.
• Funding Organization(s): Other private

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 7.80 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Starting Model: in silico

Literature

BORC assemblies integrate BLOC-1 subunits to diversify endosomal trafficking functions

de Araujo, M.E.G., Amann, S.J., Stasyk, T., Schleiffer, A., Rauch, E., Fluemann, P., Singer, I., Kremser, L., Dostal, V., Laopanupong, T., Obojes, N., Wallnoefer, M.H., Gradl, F.S., Kurzbauer, R., Krebiehl, C., Kofler, S., Grishkovskaya, I., Vogel, G.F., Hess, M.W., Sarg, B., Clausen, T., Haselbach, D., Huber, L.A.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 8-mer - A1B1C1D1E1F1G1H1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 8-mer - A3B2C1D1E1 

Biological assembly 1 assigned by authors and generated by (software)

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 135.5 kDa 
• Atom Count: 5,896 
• Modeled Residue Count: 749 
• Deposited Residue Count: 1,203 
• Unique protein chains: 8

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Biogenesis of lysosome-related organelles complex 1 subunit 1	A [auth G]	129	Caenorhabditis elegans	Mutation(s): 0  Gene Names: blos-1, T20G5.10
UniProt
Find proteins for Q22616 (Caenorhabditis elegans) Explore Q22616  Go to UniProtKB:  Q22616

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Biogenesis of lysosome-related organelles complex 1 subunit 2	B [auth H]	132	Caenorhabditis elegans	Mutation(s): 0  Gene Names: blos-2, Y73B6BL.30
UniProt
Find proteins for Q95XD3 (Caenorhabditis elegans) Explore Q95XD3  Go to UniProtKB:  Q95XD3

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
SNAPIN protein homolog	C [auth F]	122	Caenorhabditis elegans	Mutation(s): 0  Gene Names: snpn-1, C02B10.2
UniProt
Find proteins for O44445 (Caenorhabditis elegans) Explore O44445  Go to UniProtKB:  O44445

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
KxDL domain-containing protein	D [auth E]	140	Caenorhabditis	Mutation(s): 0  Gene Names: kxd-1, C13F10.2, CELE_C13F10.2
UniProt
Find proteins for O01488 (Caenorhabditis elegans) Explore O01488  Go to UniProtKB:  O01488

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
BLOC-1-related complex subunit 5	E [auth A]	240	Caenorhabditis elegans	Mutation(s): 2  Gene Names: sam-4, CELE_F59E12.11, F59E12.11
UniProt
Find proteins for O01902 (Caenorhabditis elegans) Explore O01902  Go to UniProtKB:  O01902

Entity ID: 6
Molecule	Chains	Sequence Length	Organism	Details	Image
BLOC-1-related complex subunit 6 C-terminal helix domain-containing protein	F [auth B]	163	Caenorhabditis elegans	Mutation(s): 0  Gene Names: blos-7, CELE_Y37E11B.3, Y37E11B.3
UniProt
Find proteins for Q9TYN4 (Caenorhabditis elegans) Explore Q9TYN4  Go to UniProtKB:  Q9TYN4

Entity ID: 7
Molecule	Chains	Sequence Length	Organism	Details	Image
BLOC-1-related complex subunit 7	G [auth C]	126	Caenorhabditis elegans	Mutation(s): 0  Gene Names: blos-8, CELE_R03A10.1, R03A10.1
UniProt
Find proteins for Q21655 (Caenorhabditis elegans) Explore Q21655  Go to UniProtKB:  Q21655

Entity ID: 8
Molecule	Chains	Sequence Length	Organism	Details	Image
BLOC-1-related complex subunit 8 homolog	H [auth D]	151	Caenorhabditis elegans	Mutation(s): 0  Gene Names: blos-9, K11B4.2
UniProt
Find proteins for O45685 (Caenorhabditis elegans) Explore O45685  Go to UniProtKB:  O45685

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 7.80 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-01-21 
Deposition Author(s): Amann, S.J., de Araujo, M.E.G., Grishkovskaya, I., Huber, L.A., Haselbach, D.

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Funding Organization	Location	Grant Number
Other private	Austria	--

Revision History  

• Version 1.0: 2026-01-21
  Type: Initial release