8RX8

The structure of CML18 in complex with 4 Ca2+ ions

• PDB DOI: https://doi.org/10.2210/pdb8RX8/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Arabidopsis thaliana
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2024-02-06 Released: 2024-10-09 
• Deposition Author(s): Daniel-Mozo, M., Albert, A.
• Funding Organization(s): Spanish Ministry of Science, Innovation, and Universities

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.85 Å
• R-Value Free: 0.285 
• R-Value Work: 0.250 
• R-Value Observed: 0.252 

Starting Models: experimental

Literature

The vacuolar K+/H+ exchangers and calmodulin-like CML18 constitute a pH-sensing module that regulates K+ status in Arabidopsis

Daniel-Mozo, M., Albert, A.

(null) Sci Adv 

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 18.27 kDa 
• Atom Count: 1,188 
• Modelled Residue Count: 152 
• Deposited Residue Count: 165 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Probable calcium-binding protein CML18	A	165	Arabidopsis thaliana	Mutation(s): 0  Gene Names: CML18, CAM15, At3g03000, F13E7.5
UniProt
Find proteins for Q9M8U1 (Arabidopsis thaliana) Explore Q9M8U1  Go to UniProtKB:  Q9M8U1

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA (Subject of Investigation/LOI)	B [auth A], C [auth A], D [auth A], E [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.85 Å
• R-Value Free: 0.285 
• R-Value Work: 0.250 
• R-Value Observed: 0.252 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 74.34	α = 90
b = 74.34	β = 90
c = 131.33	γ = 90

Software Package:

Software Name	Purpose
MxCuBE	data collection
autoPROC	data processing
XDS	data reduction
Aimless	data scaling
Coot	model building
PHENIX	phasing
PHENIX	refinement

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2024-10-09 
Deposition Author(s): Daniel-Mozo, M., Albert, A.

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Funding Organization	Location	Grant Number
Spanish Ministry of Science, Innovation, and Universities	Spain	PID2020-119805RB-I00
Spanish Ministry of Science, Innovation, and Universities	Spain	PRE2018-083280

Revision History  

• Version 1.0: 2024-10-09
  Type: Initial release