9KV9 | pdb_00009kv9

Crystal Structure of the Kv7.1 C-terminal Domain in Complex with Calmodulin disease mutation E141G-Ca

• PDB DOI: https://doi.org/10.2210/pdb9KV9/pdb

• Classification: METAL BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2024-12-04 Released: 2025-12-10 
• Deposition Author(s): Liu, C.
• Funding Organization(s): Not funded

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free: 
  0.279 (Depositor), 0.282 (DCC) 
• R-Value Work: 
  0.237 (Depositor), 0.238 (DCC) 
• R-Value Observed: 
  0.241 (Depositor) 

Starting Model: experimental

Literature

Crystal Structure of the Kv7.1 C-terminal Domain in Complex with Calmodulin disease mutation E141G-Ca

Liu, C.

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: gel filtration

Macromolecule Content 

• Total Structure Weight: 24.84 kDa 
• Atom Count: 1,529 
• Modeled Residue Count: 203 
• Deposited Residue Count: 215 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
KCNQ1 helixAB	A	66	Homo sapiens	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Calmodulin-1	B [auth C]	149	Homo sapiens	Mutation(s): 1  Gene Names: CALM1, CALM, CAM, CAM1
UniProt & NIH Common Fund Data Resources
Find proteins for P0DP23 (Homo sapiens) Explore P0DP23  Go to UniProtKB:  P0DP23
PHAROS:  P0DP23 GTEx:  ENSG00000198668

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	C, D [auth C], E [auth C]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free:  0.279 (Depositor), 0.282 (DCC) 
• R-Value Work:  0.237 (Depositor), 0.238 (DCC) 
• R-Value Observed: 0.241 (Depositor) 

Space Group: P 2₁ 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 39.799	α = 90
b = 63.612	β = 90
c = 78.417	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
PHENIX	refinement
HKL-3000	data reduction
HKL-3000	data scaling
PHENIX	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-12-10 
Deposition Author(s): Liu, C.

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Funding Organization	Location	Grant Number
Not funded		--

Revision History  

• Version 1.0: 2025-12-10
  Type: Initial release