2OPB

Structure of K57A hPNMT with inhibitor 3-fluoromethyl-7-thiomorpholinosulfonamide-THIQ and AdoHcy


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.236 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Enzyme Adaptation to Inhibitor Binding: A Cryptic Binding Site in Phenylethanolamine N-Methyltransferase.

Gee, C.L.Drinkwater, N.Tyndall, J.D.Grunewald, G.L.Wu, Q.McLeish, M.J.Martin, J.L.

(2007) J.Med.Chem. 50: 4845-4853

  • DOI: 10.1021/jm0703385
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Shape complementarity is a fundamental principle of inhibitor design. Here we show that an enzyme for which the crystal structure has been determined (phenylethanolamine N-methyltransferase, PNMT) conceals a cryptic binding site. This site is reveale ...

    Shape complementarity is a fundamental principle of inhibitor design. Here we show that an enzyme for which the crystal structure has been determined (phenylethanolamine N-methyltransferase, PNMT) conceals a cryptic binding site. This site is revealed upon binding of inhibitors that are double the size of the physiological substrate. These large inhibitors are not predicted to bind in that they protrude through the accessible surface calculated from a PNMT/7-aminosulfonyl-1,2,3,4-tetrahydroisoquinoline (SK&F 29661) crystal structure, yet they are potent inhibitors of PNMT. We determined structures of the enzyme complexed with large inhibitors and found that the volume of the active site increases by 140 A3 upon binding. Changes in active site size and shape are brought about by unfavorable side chain conformations and rigid body helix motions. The energetic cost is modest, estimated at 2-3 kcal/mol from mutational analyses. Our findings further underline the importance of protein flexibility in structure-based inhibitor design studies.


    Organizational Affiliation

    Institute for Molecular Bioscience and ARC Special Research Centre for Functional and Applied Genomics, University of Queensland, Brisbane, Qld, 4072 Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Phenylethanolamine N-methyltransferase
A, B
289Homo sapiensMutation(s): 0 
Gene Names: PNMT (PENT)
EC: 2.1.1.28
Find proteins for P11086 (Homo sapiens)
Go to Gene View: PNMT
Go to UniProtKB:  P11086
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
F21
Query on F21

Download SDF File 
Download CCD File 
A, B
(3R)-3-(FLUOROMETHYL)-7-(THIOMORPHOLIN-4-YLSULFONYL)-1,2,3,4-TETRAHYDROISOQUINOLINE
3-FLUOROMETHYL 7-THIOMORPHOLINOSULFONAMIDE 1,2,3,4-TETRAHYDROISOQUINOLINE
C14 H19 F N2 O2 S2
SBUKSNPHYWXCDG-CYBMUJFWSA-N
 Ligand Interaction
PO4
Query on PO4

Download SDF File 
Download CCD File 
B
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
SAH
Query on SAH

Download SDF File 
Download CCD File 
A, B
S-ADENOSYL-L-HOMOCYSTEINE
C14 H20 N6 O5 S
ZJUKTBDSGOFHSH-WFMPWKQPSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
F21Ki: 315 - 1200 nM (99) BINDINGDB
SAHKi: 29000 - 62300 nM (84) BINDINGDB
F21Ki: 1.8 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.236 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 94.420α = 90.00
b = 94.420β = 90.00
c = 187.670γ = 90.00
Software Package:
Software NamePurpose
d*TREKdata processing
CNSrefinement
CrystalCleardata collection
CNSphasing
d*TREKdata reduction
d*TREKdata scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-10-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Derived calculations, Version format compliance