11OT | pdb_000011ot

Crystal Structure of Honey Truffle Active Component 1 through 4 with HEPES bound (Orthorhombic P form)

• PDB DOI: https://doi.org/10.2210/pdb11OT/pdb

• Classification: PROTEIN BINDING
• Organism(s): Mattirolomyces terfezioides
• Expression System: Komagataella phaffii
• Mutation(s): No 


• Deposited: 2026-03-06 Released: 2026-09-23 
• Deposition Author(s): Lovell, S., Cooper, A., Connors, D.E., Pitkanen, T.T., McFarland, C.T., Vo, P., Patnaik, R.
• Funding Organization(s): Other private

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.25 Å
• R-Value Free: 
  0.164 (Depositor), 0.172 (DCC) 
• R-Value Work: 
  0.132 (Depositor), 0.144 (DCC) 
• R-Value Observed: 
  0.133 (Depositor) 

Starting Model: in silico

Literature

Crystal structures of the sweet-tasting protein honey truffle active component from Mattirolomyces terfezioides

Pitkanen, T.T., Cooper, A., Vo, P., McFarland, C.T., Patnaik, R., Lovell, S., Connors, D.E.

(2026) Acta Crystallogr F Struct Biol Commun 82: 348-355

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 27.71 kDa 
• Atom Count: 2,489 
• Modeled Residue Count: 240 
• Deposited Residue Count: 242 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Honey Truffle Active Component 1 through 4	A, B	121	Mattirolomyces terfezioides	Mutation(s): 0

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EPE (Subject of Investigation/LOI)	C [auth A], D [auth A]	4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID C8 H18 N2 O4 S JKMHFZQWWAIEOD-UHFFFAOYSA-N
PG4	F [auth A], G [auth B]	TETRAETHYLENE GLYCOL C8 H18 O5 UWHCKJMYHZGTIT-UHFFFAOYSA-N
ACT	E [auth A]	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.25 Å
• R-Value Free:  0.164 (Depositor), 0.172 (DCC) 
• R-Value Work:  0.132 (Depositor), 0.144 (DCC) 
• R-Value Observed: 0.133 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 48.112	α = 90
b = 58.915	β = 90
c = 84.088	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
Aimless	data scaling
SAINT	data reduction
PHASER	phasing
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-09-23 
Deposition Author(s): Lovell, S., Cooper, A., Connors, D.E., Pitkanen, T.T., McFarland, C.T., Vo, P., Patnaik, R.

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Funding Organization	Location	Grant Number
Other private	United States	--

Revision History  

• Version 1.0: 2026-09-23
  Type: Initial release
  
• Version 1.1: 2026-10-07
  Changes: Database references