Crystal structure of human serum albumin complexed with the general anesthetic halothane

Experimental Data Snapshot

  • Resolution: 2.38 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.270 
  • R-Value Observed: 0.270 

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Binding of the General Anesthetics Propofol and Halothane to Human Serum Albumin. High Resolution Crystal Structures

Bhattacharya, A.A.Curry, S.Franks, N.P.

(2000) J Biol Chem 275: 38731

  • DOI: https://doi.org/10.1074/jbc.M005460200
  • Primary Citation of Related Structures:  
    1E78, 1E7A, 1E7B, 1E7C

  • PubMed Abstract: 

    Human serum albumin (HSA) is one of the most abundant proteins in the circulatory system and plays a key role in the transport of fatty acids, metabolites, and drugs. For many drugs, binding to serum albumin is a critical determinant of their distribution and pharmacokinetics; however, there have as yet been no high resolution crystal structures published of drug-albumin complexes. Here we describe high resolution crystal structures of HSA with two of the most widely used general anesthetics, propofol and halothane. In addition, we describe a crystal structure of HSA complexed with both halothane and the fatty acid, myristate. We show that the intravenous anesthetic propofol binds at two discrete sites on HSA in preformed pockets that have been shown to accommodate fatty acids. Similarly we show that the inhalational agent halothane binds (at concentrations in the pharmacologically relevant range) at three sites that are also fatty acid binding loci. At much higher halothane concentrations, we have identified additional sites that are occupied. All of the higher affinity anesthetic binding sites are amphiphilic in nature, with both polar and apolar parts, and anesthetic binding causes only minor changes in local structure.

  • Organizational Affiliation

    Biophysics Section, The Blackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2BW, United Kingdom.

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
585Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P02768 (Homo sapiens)
Explore P02768 
Go to UniProtKB:  P02768
GTEx:  ENSG00000163631 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02768
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.38 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.270 
  • R-Value Observed: 0.270 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.58α = 81.39
b = 54.96β = 90.79
c = 120γ = 65.55
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-01-17
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-07-24
    Changes: Data collection
  • Version 1.4: 2023-12-13
    Changes: Data collection, Database references, Other, Refinement description