9K7X | pdb_00009k7x

Crystal structure of designed calcium-induced homotrimer C3-Ca1-DN*3-20

PDB DOI: https://doi.org/10.2210/pdb9K7X/pdb

Classification: METAL BINDING PROTEIN
Organism(s): Escherichia coli
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2024-10-24 Released: 2025-10-29
Deposition Author(s): Qu, Y.N., Cao, L.X.
Funding Organization(s): Ministry of Science and Technology (MoST, China)

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.00 Å
R-Value Free:
0.227 (Depositor), 0.227 (DCC)
R-Value Work:
0.172 (Depositor), 0.172 (DCC)
R-Value Observed:
0.176 (Depositor)

Starting Model: in silico
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wwPDB Validation 3D Report Full Report

Validation slider image for 9K7X

This is version 1.0 of the entry. See complete history.

Literature

De novo design of metal ion regulated protein assemblies

Qu, Y.N., Cao, L.X.

To be published.

Macromolecule Content

Total Structure Weight: 75.07 kDa
Atom Count: 4,473
Modeled Residue Count: 531
Deposited Residue Count: 672
Unique protein chains: 1

Macromolecules

Find similar proteins by:

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
C3-Ca1-DN*3-20	A, B, C, D, E A, B, C, D, E, F	112	Escherichia coli	Mutation(s): 0

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
TRS Query on TRS Download:Ideal Coordinates CCD File SDF format, chain J [auth D] MOL2 format, chain J [auth D] mmCIF format, chain J [auth D]	J [auth D]	2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL C₄ H₁₂ N O₃ LENZDBCJOHFCAS-UHFFFAOYSA-O		Interactions Focus chain J [auth D] Interactions & Density Focus chain J [auth D]
CA (Subject of Investigation/LOI) Query on CA Download:Ideal Coordinates CCD File SDF format, chain I [auth C] SDF format, chain H [auth A] SDF format, chain G [auth A] MOL2 format, chain I [auth C] MOL2 format, chain H [auth A] MOL2 format, chain G [auth A] mmCIF format, chain I [auth C] mmCIF format, chain H [auth A] mmCIF format, chain G [auth A]	G [auth A], H [auth A], I [auth C]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N		Interactions Focus chain G [auth A] Focus chain H [auth A] Focus chain I [auth C] Interactions & Density Focus chain G [auth A] Focus chain H [auth A] Focus chain I [auth C]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 2.00 Å
R-Value Free: 0.227 (Depositor), 0.227 (DCC)
R-Value Work: 0.172 (Depositor), 0.172 (DCC)
R-Value Observed: 0.176 (Depositor)

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 34.614	α = 90
b = 77.562	β = 92.46
c = 82.814	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
CrysalisPro	data reduction
CrysalisPro	data scaling
PHENIX	phasing

Structure Validation

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Entry History

& Funding Information

Deposition Data

Released Date: 2025-10-29

Deposition Author(s):

Funding Organization	Location	Grant Number
Ministry of Science and Technology (MoST, China)	China	--

Revision History (Full details and data files)

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

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.