Human plasma high density lipoproteins (HDL) were labeled in vitro with [125I]apoA-I. Chromatography of the [125I]HDL on Sephacryl S-200 revealed that a certain fraction of [125I]apoA-I readily dissociates from the intact particle over a wide range of HDL concentrations. The relatively constant value of the dissociated apoA-I concentration observed at various HDL concentrations suggests that a "critical monomer concentration" of apoA-I is in equilibrium with the parent lipoprotein. Addition of [131I]apoC proteins to HDL induces additional dissociation of oligomeric apoA-I with the concomitant incorporation of apoC into a new particle of about 460,000 daltons.
|Original language||English (US)|
|Number of pages||7|
|Journal||Biochemical and Biophysical Research Communications|
|State||Published - Nov 14 1978|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology