Structures of porcine beta-trypsin-detergent complexes: the stabilization of proteins through hydrophilic binding of polydocanol.Deepthi, S., Johnson, A., Pattabhi, V.
(2001) Acta Crystallogr.,Sect.D 57: 1506-1512
- PubMed: 11679713
- Primary Citation of Related Structures:  1FN6, 1FNI
- PubMed Abstract:
- Crystal Structure at 1.63 Angstroms Resolution of the Native Form of Porcine Beta Trypsin : Revealing an Acetate Ion Binding Site and Functional Water Network
Johnson, A.,Gautham, N.,Pattabhi, V.
(1999) BIOCHIM.BIOPHYS.ACTA 1435: 7
- The First Structure at 1.8 Angstroms Resolution of an Active Autolysate Form of Porcine Alpha Trypsin
Johnson, A.,Krishnaswamy, S.,Sundaram, P.V.,Pattabhi, V.
(1997) Acta Crystallogr.,Sect.D 53: 311
Polydocanol has a wide range of medical applications, especially in sclerotherapy of many diseases such as gastrointestinal antiplastia, oesophageal haemangioma etc. It is of interest to study the mode of binding of this medically important detergent ...
Polydocanol has a wide range of medical applications, especially in sclerotherapy of many diseases such as gastrointestinal antiplastia, oesophageal haemangioma etc. It is of interest to study the mode of binding of this medically important detergent and its subsequent action on proteins. Here, three crystal structures of serine protease trypsin are reported in the presence of varying concentrations of polydocanol in order to elucidate its mode of binding and interactions with proteins. Polydocanol binds to the protein with its hydrophilic head rather than the hydrophobic tail as is the case with other detergents such as SDS and MEGA-8. This hydrophilic binding mode results in the binding sites of polydocanol being distributed on the surface of the enzyme. There are at least 11 binding sites for polydocanol in trypsin. Polydocanol forms part of the large-scale water networks which connect distant regions of the enzyme, thereby stabilizing it. The hydrophilic binding of polydocanol also results in cross-linked pairs of trypsin molecules.
Department of Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India.