6MDQ

Crystal structure of equine serum albumin in complex with testosterone


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Testosterone meets albumin - the molecular mechanism of sex hormone transport by serum albumins.

Czub, M.P.Venkataramany, B.S.Majorek, K.A.Handing, K.B.Porebski, P.J.Beeram, S.R.Suh, K.Woolfork, A.G.Hage, D.S.Shabalin, I.G.Minor, W.

(2019) Chem Sci 10: 1607-1618

  • DOI: 10.1039/c8sc04397c

  • PubMed Abstract: 
  • Serum albumin is the most abundant protein in mammalian blood plasma and is responsible for the transport of metals, drugs, and various metabolites, including hormones. We report the first albumin structure in complex with testosterone, the primary m ...

    Serum albumin is the most abundant protein in mammalian blood plasma and is responsible for the transport of metals, drugs, and various metabolites, including hormones. We report the first albumin structure in complex with testosterone, the primary male sex hormone. Testosterone is bound in two sites, neither of which overlaps with the previously suggested Sudlow site I. We determined the binding constant of testosterone to equine and human albumins by two different methods: tryptophan fluorescence quenching and ultrafast affinity extraction. The binding studies and similarities between residues comprising the binding sites on serum albumins suggest that testosterone binds to the same sites on both proteins. Our comparative analysis of albumin complexes with hormones, drugs, and other biologically relevant compounds strongly suggests interference between a number of compounds present in blood and testosterone transport by serum albumin. We discuss a possible link between our findings and some phenomena observed in human patients, such as low testosterone levels in diabetic patients.


    Organizational Affiliation

    Department of Molecular Physiology and Biological Physics , University of Virginia , 1340 Jefferson Park Avenue , Charlottesville , VA 22908 , USA . Email: wladek@iwonka.med.virginia.edu ; Email: ivan_s@iwonka.med.virginia.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serum albumin
A
583Equus caballusMutation(s): 0 
Gene Names: ALB
Find proteins for P35747 (Equus caballus)
Go to Gene View: ALB
Go to UniProtKB:  P35747
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FLC
Query on FLC

Download SDF File 
Download CCD File 
A
CITRATE ANION
C6 H5 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-K
 Ligand Interaction
TES
Query on TES

Download SDF File 
Download CCD File 
A
TESTOSTERONE
C19 H28 O2
MUMGGOZAMZWBJJ-DYKIIFRCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

Unit Cell:
Length (Å)Angle (°)
a = 94.244α = 90.00
b = 94.244β = 90.00
c = 142.345γ = 120.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-3000data reduction
HKL-3000data scaling
REFMACrefinement
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited States--

Revision History 

  • Version 1.0: 2018-09-26
    Type: Initial release
  • Version 1.1: 2019-04-03
    Type: Data collection, Database references