44ID | pdb_000044id

Drosophila AHR PAS-B M284C/Y336L mutant in complex with alpha-naphthoflavone

PDB DOI: https://doi.org/10.2210/pdb44ID/pdb

Classification: TRANSCRIPTION
Organism(s): Drosophila melanogaster
Expression System: Escherichia coli
Mutation(s): Yes

Deposited: 2026-07-30 Released: 2026-08-19
Deposition Author(s): Dai, S.Y., Tang, J.M.
Funding Organization(s): Other government

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.51 Å
R-Value Free:
0.192 (Depositor), 0.193 (DCC)
R-Value Work:
0.172 (Depositor), 0.172 (DCC)

Starting Model: experimental
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Ligand Structure Quality Assessment

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

Literature

ARNT association reshapes ligand recognition by AHR PAS-B domain

Dai, S.Y., Tang, J.M.

To be published.

Macromolecule Content

Total Structure Weight: 28.01 kDa
Atom Count: 2,015
Modeled Residue Count: 226
Deposited Residue Count: 240
Unique protein chains: 1

Macromolecules

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Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ahr homolog spineless	A, B	120	Drosophila melanogaster	Mutation(s): 2 Gene Names: ss, CG6993
UniProt
Find proteins for O61543 (Drosophila melanogaster) Explore O61543 Go to UniProtKB: O61543
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	O61543
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
BHF (Subject of Investigation/LOI) Query on BHF 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]	2-PHENYL-4H-BENZO[H]CHROMEN-4-ONE C₁₉ H₁₂ O₂ VFMMPHCGEFXGIP-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: 1.51 Å
R-Value Free: 0.192 (Depositor), 0.193 (DCC)
R-Value Work: 0.172 (Depositor), 0.172 (DCC)

Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 60.307	α = 90
b = 60.307	β = 90
c = 120.023	γ = 90

Software Package:

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

Structure Validation

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Ligand Structure Quality Assessment

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Entry History

& Funding Information

Deposition Data

Released Date: 2026-08-19

Deposition Author(s):

Funding Organization	Location	Grant Number
Other government	China	2021RC2034

Revision History (Full details and data files)

Version 1.0: 2026-08-19
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.