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. 1990 Aug;58(2):413–428. doi: 10.1016/S0006-3495(90)82387-0

Slow rotational mobilities of antibodies and lipids associated with substrate-supported phospholipid monolayers as measured by polarized fluorescence photobleaching recovery.

M M Timbs 1, N L Thompson 1
PMCID: PMC1280982  PMID: 2207246

Abstract

Polarized fluorescence photobleaching recovery has been used to monitor slow rotational motions of a fluorescently-labeled anti-dinitrophenyl mouse IgGl monoclonal antibody (ANO2) specifically bound to substrate-supported monolayers composed of a mixture of distearoylphosphatidylcholine (DSPC) and dinitrophenyldioleoylphosphatidylethanolamine (DNP-DOPE). ANO2 antibodies were labeled with a new bifunctional carbocyanine fluorophore that has two amino-reactive groups; steady-state fluorescence anisotropy data confirmed the expected result that the ANO2-conjugated bifunctional probe had less independent flexibility than ANO2-conjugated unifunctional fluorescence labels. Rotational mobilities were also measured for the fluorescent lipid 1,1'-dioctadecyl 3,3,3',3'-tetramethylindocarbocyanine (dil) in DSPC and in mixed DSPC/DNP-DOPE monolayers in the presence and absence of unlabeled ANO2 antibodies. The apparent rotational correlation time and fractional mobility of ANO2 on supported monolayers were approximately 70 and approximately 0.3 s, respectively. These measured parameters of rotational mobility did not depend on the ANO2 surface density or on kinetic factors, but addition of unlabeled polyclonal anti-(mouse IgG) antibodies significantly decreased the apparent mobile fraction. The measured fluorescence recovery curves for dil were consistent with two fluorophore populations with rotational correlation times of approximately 4 and approximately 100 s and a population of immobile fluorescent lipid. No difference in fluorescence recovery and decay curves was measured for dil in DSPC monolayers, DSPC/DNP-DOPE monolayers, and DSPC/DNP-DOPE monolayers treated with unlabeled ANO2 antibodies.

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Selected References

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