Interaction of nominally soluble proteins with phospholipid monolayers at the air-water interface.
The interactions of carbonmonoxyhemoglobin (HbCO), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), and polyhistidine with phospholipid monolayers at the air-water interface were studied at physiological pH and ionic strength. HbCO and GAPDH both interact more strongly with monolayers containing negatively charged lipids. The interaction of HbCO and GAPDH with lipid monolayers decreases with increasing pH. Both the HbCO-monolayer and the GAPDH-monolayer interactions can be modeled as diffusion-limited processes, with kinetic data fit to a stretched exponential equation. The significance of these kinetics are discussed. Polyhistidine interacts only with monolayers containing lipids with negatively charged headgroups. In total, the results presented are consistent with an HbCO-lipid interaction with a large electrostatic component, a GAPDH-lipid interaction with comparable electrostatic and hydrophobic components, and a polyhistidine-lipid interaction that is solely electrostatic.
Pitcher
Wayne H
WH
Department of Chemistry, Stanford University, CA 94305, USA. pitcher@niehs.nih.gov
Keller
Sarah L
SL
Huestis
Wray H
WH
D000388:Air; D002263:Carboxyhemoglobin / Q000737:chemistry; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000737:chemistry; D006639:Histidine; D006801:Humans; D006863:Hydrogen-Ion Concentration; D066298:In Vitro Techniques; D007700:Kinetics; D008563:Membrane Lipids / Q000737:chemistry; D009994:Osmolar Concentration; D010455:Peptides / Q000737:chemistry; D010743:Phospholipids / Q000737:chemistry*; D011312:Pressure; D011506:Proteins / Q000737:chemistry*; D012995:Solubility; D055672:Static Electricity; D014783:Viscosity; D014867:Water
D008563:Membrane Lipids; D010455:Peptides; D010743:Phospholipids; D011506:Proteins; D014867:Water; C033223:polyhistidine; D006639:Histidine; D002263:Carboxyhemoglobin; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases