Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 8-mer - A4B4 

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

Macromolecule Content

• Total Structure Weight: 110.04 kDa 
• Atom Count: 7,880 
• Modelled Residue Count: 943 
• Deposited Residue Count: 944 
• Unique protein chains: 2

 6QLB

Calpain small subunit 1, RNA-binding protein Hfq

• PDB DOI:  https://doi.org/10.2210/pdb6QLB/pdb

• Classification: DNA BINDING PROTEIN
• Organism(s): Homo sapiens, Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2019-01-31 Released: 2020-02-05 
• Deposition Author(s): Rizkallah, P.J., Cresser-Brown, J.O.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.32 Å
• R-Value Free: 0.247 
• R-Value Work: 0.201 
• R-Value Observed: 0.203 

Literature

Calpain small subunit 1, RNA-binding protein Hfq

Rizkallah, P.J., Cresser-Brown, J.O.

(null) Acta Crystallogr Sect F Struct Biol Cryst Commun 

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Calpain small subunit 1	A, B, C, D	173	Homo sapiens	Mutation(s): 0  Gene Names: CAPNS1, CAPN4, CAPNS
UniProt & NIH Common Fund Data Resources
Find proteins for P04632 (Homo sapiens) Explore P04632  Go to UniProtKB:  P04632
PHAROS:  P04632

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
RNA-binding protein Hfq	E, F, G, H	63	Escherichia coli	Mutation(s): 0  Gene Names: hfq, NCTC13125_02619
UniProt
Find proteins for P0A6X3 (Escherichia coli (strain K12)) Explore P0A6X3  Go to UniProtKB:  P0A6X3

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
P4G	U [auth B], V [auth C]	1-ETHOXY-2-(2-ETHOXYETHOXY)ETHANE C8 H18 O3 RRQYJINTUHWNHW-UHFFFAOYSA-N
GUN	GA [auth E], HA [auth F], IA [auth H], N [auth A]	GUANINE C5 H5 N5 O UYTPUPDQBNUYGX-UHFFFAOYSA-N
EDO	O [auth A]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N
CA	AA [auth C], BA [auth D], CA [auth D], DA [auth D], EA [auth D], FA [auth D], I [auth A], J [auth A], K [auth A], L [auth A], M [auth A], P [auth B], Q [auth B], R [auth B], S [auth B], T [auth B], W [auth C], X [auth C], Y [auth C], Z [auth C]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.32 Å
• R-Value Free: 0.247 
• R-Value Work: 0.201 
• R-Value Observed: 0.203 
• Space Group: P 2₁ 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 147.607	α = 90
b = 147.607	β = 90
c = 147.607	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
xia2	data reduction
Aimless	data scaling
PHASER	phasing
XDS	data reduction

Structure Validation

Entry History 

Deposition Data

• Released Date: 2020-02-05 
Deposition Author(s): Rizkallah, P.J., Cresser-Brown, J.O.

Revision History  

• Version 1.0: 2020-02-05
  Type: Initial release