3HF6 | pdb_00003hf6

Crystal structure of human tryptophan hydroxylase type 1 with bound LP-521834 and FE

• PDB DOI: https://doi.org/10.2210/pdb3HF6/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 2009-05-11 Released: 2009-11-24 
• Deposition Author(s): Tari, L.W., Swanson, R.V., Hunter, M.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 
  0.217 (Depositor) 
• R-Value Work: 
  0.181 (Depositor), 0.188 (DCC) 

Literature

Mechanism of Inhibition of Novel Tryptophan Hydroxylase Inhibitors Revealed by Co-crystal Structures and Kinetic Analysis

Cianchetta, G., Stouch, T., Yu, W., Shi, Z.-C., Tari, L.W., Swanson, R.V., Hunter, M.J., Hoffman, I.D., Liu, Q.

(2010) Bioorg Med Chem Lett 4: 19-26

• PubMed: 19631532 
• DOI: https://doi.org/10.1016/j.bmcl.2009.07.005
• Primary Citation Related Structures: 
  3HF6


• PubMed Abstract: 
  

  Tryptophan hydroxylase (TPH) is a key enzyme in the synthesis of serotonin. As a neurotransmitter, serotonin plays important physiological roles both peripherally and centrally. Here we describe the discovery of substituted triazines as a novel class of tryptophan hydroxylase inhibitors. This class of TPH inhibitors can selectively reduce serotonin levels in murine intestine after oral administration without affecting levels in the brain. These TPH inhibitors may provide novel treatments for gastrointestinal disorders associated with dysregulation of the serotonergic system, such as chemotherapy-induced emesis and irritable bowel syndrome.

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Organizational Affiliation: 
• Lexicon Pharmaceuticals, 350 Carter Road, Princeton, NJ 08540, USA. [e-mail]

Biological Assembly 1  

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 33.77 kDa 
• Atom Count: 2,574 
• Modeled Residue Count: 280 
• Deposited Residue Count: 290 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Tryptophan 5-hydroxylase 1	A	290	Homo sapiens	Mutation(s): 0  EC: 1.14.16.4
UniProt & NIH Common Fund Data Resources
Find proteins for P17752 (Homo sapiens) Explore P17752  Go to UniProtKB:  P17752
PHAROS:  P17752 GTEx:  ENSG00000129167

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
LX0	C [auth A]	4-(4-amino-6-{[(1R)-1-naphthalen-2-ylethyl]amino}-1,3,5-triazin-2-yl)-L-phenylalanine C24 H24 N6 O2 UXYOCRLZKBFANG-VLIAUNLRSA-N
FE	B [auth A]	FE (III) ION Fe VTLYFUHAOXGGBS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free:  0.217 (Depositor) 
• R-Value Work:  0.181 (Depositor), 0.188 (DCC) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 47.199	α = 90
b = 57.893	β = 93
c = 55.604	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 2009-11-24 
Deposition Author(s): Tari, L.W., Swanson, R.V., Hunter, M.J.

Revision History  

• Version 1.0: 2009-11-24
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2024-02-21
  Changes: Data collection, Database references, Derived calculations
• Version 1.3: 2026-02-11
  Changes: Data collection, Structure summary