title: Competitive binding of Chlorin p6 and Dansyl-l-Proline to Sudlow's site II of human serum albumin.
abstract: The binding of chlorin p6, a model photosensitizer for photodynamic therapy (PDT), to the Sudlow's site II of Human Serum Albumin (HSA) has been monitored by different spectroscopic methods. Displacement of Dansyl-l-Proline (DP) from its conjugate with HSA is manifested in the spectral shift and decrease in its fluorescence intensity as well as the emergence of component with lifetime of 2-3ns, which is characteristic of free DP. As DP is known to bind specifically to the Sudlow's site II of human serum albumin, its displacement by chlorin p6 indicates the residence of the photosensitizer in the same site, in addition to Sudlow's site I. The binding constants for Sudlow's site II, determined by the stopped-flow technique, are found to be two orders of magnitude smaller than that for Sudlow's site I.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India. Electronic address: sunitapatel2002@gmail.com.
authors.forename: Sunita
authors.initials: S
authors.lastname: Patel
authors.affiliation: Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India. Electronic address: kaushalsharmanccs@gmail.com.
authors.forename: Kaushal Kishor
authors.initials: KK
authors.lastname: Sharma
authors.affiliation: Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India. Electronic address: anindya@chem.iitb.ac.in.
authors.forename: Anindya
authors.initials: A
authors.lastname: Datta
mesh_terms: D001665:Binding Sites; D001667:Binding, Competitive; D003619:Dansyl Compounds / Q000737:chemistry / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D011166:Porphyrins / Q000737:chemistry / Q000378:metabolism*; D011392:Proline / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D011485:Protein Binding; D012709:Serum Albumin / Q000378:metabolism*; D013050:Spectrometry, Fluorescence; D013997:Time Factors
chemical_list: D003619:Dansyl Compounds; D011166:Porphyrins; D012709:Serum Albumin; C086697:dansylproline; C072905:chlorin p6; D011392:Proline
keywords: Chlorin; Specific binding; Stopped-flow; Sudlow’s site; Time resolved fluorescence