1TLM

STRUCTURAL ASPECTS OF INOTROPIC BIPYRIDINE BINDING: CRYSTAL STRUCTURE DETERMINATION TO 1.9 ANGSTROMS OF THE HUMAN SERUM TRANSTHYRETIN-MILRINONE COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural aspects of inotropic bipyridine binding. Crystal structure determination to 1.9 A of the human serum transthyretin-milrinone complex.

Wojtczak, A.Luft, J.R.Cody, V.

(1993) J.Biol.Chem. 268: 6202-6206


  • PubMed Abstract: 
  • The crystal structure of human transthyretin (TTR) complexed with milrinone (2-methyl-5-cyano-3,4'-bipyridin-6(1H)-one), a positive inotropic cardiac agent, has been refined to R = 17.4% for 8-1.9-A resolution data. This report provides the first det ...

    The crystal structure of human transthyretin (TTR) complexed with milrinone (2-methyl-5-cyano-3,4'-bipyridin-6(1H)-one), a positive inotropic cardiac agent, has been refined to R = 17.4% for 8-1.9-A resolution data. This report provides the first detailed description of protein interactions for an inotropic bipyridine agent which is an effective thyroid hormone binding competitor to transthyretin. Milrinone is bound along the 2-fold axis in the binding site with its substituted pyridone ring located deep within the channel of the two identical binding domains of the TTR tetramer. In this orientation the 5-cyano group occupies the same site as the 3'-iodine in the TTR complex with 3,3'-diiodothyronine (Wojtczak, A., Luft, J., and Cody, V. (1992) J. Biol. Chem. 267, 353-357), which is 3.5 A deeper in the channel than thyroxine (Blake, C. C. F., and Oately, S. J., (1977) Nature 268, 115-120). These structural results confirm computer modeling studies of milrinone structural homology with thyroxine and its TTR binding interactions and explain the effectiveness of milrinone competition for thyroxine binding to TTR. To understand the weaker binding affinity of the parent inotropic drug, amrinone (5-amino-3,4'-bipyridin-6(1H)-one), modeling studies of its TTR binding were carried out which indicate that the 5-amino group cannot participate in strong interactions with TTR and the lack of the 2-methyl further weakens amrinone binding.


    Related Citations: 
    • An X-Ray Study of the Subunit Structure of Prealbumin
      Blake, C.C.F.,Swan, I.D.A.,Rerat, C.,Berthou, J.,Laurent, A.,Rerat, B.
      (1971) J.Mol.Biol. 61: 217
    • Structure of Human Plasma Prealbumin at 2.5 Angstroms Resolution, a Preliminary Report on the Polypeptide Chain Conformation, Quaternary Structure and Thyroxine Binding
      Blake, C.C.F.,Geisow, M.J.,Swan, I.D.A.,Rerat, C.,Rerat, B.
      (1974) J.Mol.Biol. 88: 1
    • Crystal Structure Determination at 2.3 Angstroms Resolution of Human Transthyretin-3', 5'-Dibromo-2',4,4',6-Tetrahydroxyaurone Complex
      Ciszak, E.,Cody, V.,Luft, J.R.
      (1992) Proc.Natl.Acad.Sci.USA 89: 6644
    • Dayhoff, M.O.
      (1976) Atlas of Protein Sequence and Structure,Supplement 2 5: 265
    • Mechanism of Molecular Recognition. Structural Aspects of 3,3'-Diiodo-L-Thyronine Binding to Human Serum Transthyretin
      Wojtczak, A.,Luft, J.,Cody, V.
      (1992) J.Biol.Chem. 267: 353
    • Protein-DNA and Protein-Hormone Interactions in Prealbumin, a Model of the Thyroid Hormone Nuclear Receptor (Query)
      Blake, C.C.F.,Oatley, S.J.
      (1977) Nature 268: 115
    • Feldmann, R.J.
      (1976) Atlas of Macromolecular Structure on Microfiche --: 549


    Organizational Affiliation

    Medical Foundation of Buffalo Inc., New York 14203.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRANSTHYRETIN
A, B
127Homo sapiensMutation(s): 0 
Gene Names: TTR (PALB)
Find proteins for P02766 (Homo sapiens)
Go to Gene View: TTR
Go to UniProtKB:  P02766
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MIL
Query on MIL

Download SDF File 
Download CCD File 
A, B
MILRINONE
C12 H9 N3 O
PZRHRDRVRGEVNW-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 44.178α = 90.00
b = 86.384β = 90.00
c = 66.212γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other