8S05 | pdb_00008s05

ArnAB complex an archaeal ortholog of the Sec23/24 core motif

• PDB DOI: https://doi.org/10.2210/pdb8S05/pdb

• Classification: PROTEIN BINDING
• Organism(s): Sulfolobus acidocaldarius DSM 639
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2024-02-13 Released: 2025-10-29 
• Deposition Author(s): Korf, L., Steinchen, W., Watad, M., Bezold, F., Vogt, M.S., Selbach, L., Penner, A., Tourte, M., Hepp, S., Albers, S.V., Essen, L.-O.
• Funding Organization(s): Volkswagen Foundation

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.11 Å
• R-Value Free: 
  0.264 (Depositor), 0.259 (DCC) 
• R-Value Work: 
  0.208 (Depositor), 0.205 (DCC) 
• R-Value Observed: 
  0.211 (Depositor) 

Starting Model: experimental

Literature

Sequential conformational transition of ArnB, an archaeal ortholog with Sec23/Sec24 core motif

Korf, L., Steinchen, W., Watad, M., Bezold, F., Vogt, M.S., Selbach, L., Penner, A., Tourte, M., Hepp, S., Albers, S.V., Essen, L.-O.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Biological Assembly Evidence: SAXS, gel filtration

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 137.49 kDa 
• Atom Count: 6,464 
• Modeled Residue Count: 814 
• Deposited Residue Count: 1,220 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Conserved protein	A, B	387	Sulfolobus acidocaldarius DSM 639	Mutation(s): 0  Gene Names: Saci_1211
UniProt
Find proteins for Q4J9H3 (Sulfolobus acidocaldarius (strain ATCC 33909 / DSM 639 / JCM 8929 / NBRC 15157 / NCIMB 11770)) Explore Q4J9H3  Go to UniProtKB:  Q4J9H3

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Conserved protein	C, D	223	Sulfolobus acidocaldarius DSM 639	Mutation(s): 0  Gene Names: Saci_1210
UniProt
Find proteins for Q4J9H4 (Sulfolobus acidocaldarius (strain ATCC 33909 / DSM 639 / JCM 8929 / NBRC 15157 / NCIMB 11770)) Explore Q4J9H4  Go to UniProtKB:  Q4J9H4

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	G [auth C], H [auth D]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
NA	E [auth A], F [auth B]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.11 Å
• R-Value Free:  0.264 (Depositor), 0.259 (DCC) 
• R-Value Work:  0.208 (Depositor), 0.205 (DCC) 
• R-Value Observed: 0.211 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 50.1	α = 90
b = 147.4	β = 107.16
c = 62.64	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
STARANISO	data scaling
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2025-10-29 
Deposition Author(s): Korf, L., Steinchen, W., Watad, M., Bezold, F., Vogt, M.S., Selbach, L., Penner, A., Tourte, M., Hepp, S., Albers, S.V., Essen, L.-O.

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Funding Organization	Location	Grant Number
Volkswagen Foundation	Germany	Az-96727

Revision History  

• Version 1.0: 2025-10-29
  Type: Initial release