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Structural Basis of Binding of Fluorescent, Site-Specific Dansylated Amino Acids to Human Serum Albumin.

(2011) J Struct Biol 174: 84

• PubMed: 20940056 Search on PubMedSearch on PubMed Central
• DOI: https://doi.org/10.1016/j.jsb.2010.10.004
• Primary Citation Related Structures: 
  2XSI, 2XVQ, 2XVU, 2XVV, 2XVW, 2XW0, 2XW1


• PubMed Abstract: 
  

  Human serum albumin (HSA) has two primary binding sites for drug molecules. These sites selectively bind different dansylated amino acid compounds, which-due to their intrinsic fluorescence-have long been used as specific markers for the drug pockets on HSA. We present here the co-crystal structures of HSA in complex with six dansylated amino acids that are specific for either drug site 1 (dansyl-l-asparagine, dansyl-l-arginine, dansyl-l-glutamate) or drug site 2 (dansyl-l-norvaline, dansyl-l-phenylalanine, dansyl-l-sarcosine). Our results explain the structural basis of the site-specificity of different dansylated amino acids. They also show that fatty acid binding has only a modest effect on binding of dansylated amino acids to drug site 1 and identify the location of secondary binding sites.

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Organizational Affiliation: 
• Biophysics Section, Blackett Laboratory, Imperial College, Exhibition Road, London SW7 2AZ, United Kingdom.