9UAI | pdb_00009uai

Crystal structure of cyanobacterial CRD of CmpBCD in the presence of nitrate

PDB DOI: https://doi.org/10.2210/pdb9UAI/pdb

Classification: TRANSPORT PROTEIN
Organism(s): Pseudanabaena sp. Chao 1811
Expression System: Escherichia coli BL21(DE3)
Mutation(s): No

Deposited: 2025-04-01 Released: 2026-04-08
Deposition Author(s): Li, Q.Y., Li, B., Zhou, C.Z., Jiang, Y.L.
Funding Organization(s): National Natural Science Foundation of China (NSFC)

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.75 Å
R-Value Free:
0.229 (Depositor), 0.230 (DCC)
R-Value Work:
0.197 (Depositor), 0.197 (DCC)
R-Value Observed:
0.199 (Depositor)

Starting Model: experimental
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This is version 1.0 of the entry. See complete history.

Literature

Cryo-EM structure of cyanobacterial bicarbonate transporter CmpBCD

Li, Q.Y., Li, B., Zhou, C.Z., Jiang, Y.L.

To be published.

Macromolecule Content

Total Structure Weight: 44.53 kDa
Atom Count: 3,187
Modeled Residue Count: 373
Deposited Residue Count: 400
Unique protein chains: 1

Macromolecules

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Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Nitrate transport ATP-binding subunits C and D	A [auth E]	400	Pseudanabaena sp. Chao 1811	Mutation(s): 0 Gene Names: nrtC, ABRG53_2086

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
NO3 (Subject of Investigation/LOI) Query on NO3 Download:Ideal Coordinates CCD File SDF format, chain B [auth E] MOL2 format, chain B [auth E] mmCIF format, chain B [auth E]	B [auth E]	NITRATE ION N O₃ NHNBFGGVMKEFGY-UHFFFAOYSA-N		Interactions Focus chain B [auth E] Interactions & Density Focus chain B [auth E]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 1.75 Å
R-Value Free: 0.229 (Depositor), 0.230 (DCC)
R-Value Work: 0.197 (Depositor), 0.197 (DCC)
R-Value Observed: 0.199 (Depositor)

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 92.271	α = 90
b = 49.958	β = 116.7
c = 97.585	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
Aimless	data scaling
PHENIX	phasing

Structure Validation

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Entry History

& Funding Information

Deposition Data

Released Date: 2026-04-08

Deposition Author(s):

Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	--

Revision History (Full details and data files)

Version 1.0: 2026-04-08
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.