9U5V | pdb_00009u5v

Structure of Chloroflexus aggregans flavin based fluorescent protein (CagFbFP) Q89E variant (complex with LC)

PDB DOI: https://doi.org/10.2210/pdb9U5V/pdb

Classification: FLUORESCENT PROTEIN
Organism(s): Chloroflexus aggregans DSM 9485
Expression System: Escherichia coli
Mutation(s): Yes

Deposited: 2025-03-22 Released: 2026-03-25
Deposition Author(s): Nikolaev, A., Markeeva, E., Remeeva, A., Borshchevsky, V., Gushchin, I.
Funding Organization(s): Not funded

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.66 Å
R-Value Free:
0.238 (Depositor), 0.246 (DCC)
R-Value Work:
0.189 (Depositor), 0.198 (DCC)

Starting Model: experimental
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Ligand Structure Quality Assessment

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

Literature

Discovery of excited state proton transfer in flavin-based fluorescent protein with large Stokes shift

Nikolaev, A., Markeeva, E.

To be published.

Macromolecule Content

Total Structure Weight: 25.29 kDa
Atom Count: 1,861
Modeled Residue Count: 211
Deposited Residue Count: 226
Unique protein chains: 1

Macromolecules

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Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
histidine kinase	A, B	113	Chloroflexus aggregans DSM 9485	Mutation(s): 2 Gene Names: Cagg_3753 EC: 2.7.13.3
UniProt
Find proteins for B8GAY9 (Chloroflexus aggregans (strain MD-66 / DSM 9485)) Explore B8GAY9 Go to UniProtKB: B8GAY9
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	B8GAY9
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
LUM (Subject of Investigation/LOI) Query on LUM Download:Ideal Coordinates CCD File SDF format, chain C [auth A] SDF format, chain D [auth B] MOL2 format, chain C [auth A] MOL2 format, chain D [auth B] mmCIF format, chain C [auth A] mmCIF format, chain D [auth B]	C [auth A], D [auth B]	LUMICHROME C₁₂ H₁₀ N₄ O₂ ZJTJUVIJVLLGSP-UHFFFAOYSA-N		Interactions Focus chain C [auth A] Focus chain D [auth B] Interactions & Density Focus chain C [auth A] Focus chain D [auth B]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 1.66 Å
R-Value Free: 0.238 (Depositor), 0.246 (DCC)
R-Value Work: 0.189 (Depositor), 0.198 (DCC)

Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 53.749	α = 90
b = 107.577	β = 90
c = 38.932	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
STARANISO	data scaling
MOLREP	phasing

Structure Validation

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Ligand Structure Quality Assessment

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Entry History

& Funding Information

Deposition Data

Released Date: 2026-03-25

Deposition Author(s):

Borshchevsky, V.

Funding Organization	Location	Grant Number
Not funded		--

Revision History (Full details and data files)

Version 1.0: 2026-03-25
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.