Monitoring human parvovirus B19 virus-like particles and antibody complexes in solution by fluorescence correlation spectroscopy.

Abstract:

:Fluorescence correlation spectroscopy (FCS) was used in monitoring human parvovirus B19 virus-like particle (VLP) antibody complexes from acute phase and past-immunity serum samples. The Oregon Green 488-labeled VLPs gave an average diffusion coefficient of 1.7 x 10(-7) cm2 s(-1) with an apparent hydrodynamic radius of 14 nm. After incubation of the fluorescent VLPs with an acute phase serum sample, the mobility information obtained from the fluorescence intensity fluctuation by autocorrelation analysis showed an average diffusion coefficient of 1.5 x 10(-8) cm2 s(-1), corresponding to an average radius of 157 nm. In contrast, incubation of the fluorescent VLPs with a past-immunity serum sample gave an average diffusion coefficient of 3.5 x 10(-8) cm2 s(-1) and a radius of 69 nm. A control serum devoid of B19 antibodies caused a change in the diffusion coefficient from 1.7 x 10(-7) to 1.6 x 10(-7) cm2 s(-1), which is much smaller than that observed with acute phase or past-immunity sera. Thus, VLP-antibody complexes with different diffusion coefficients could be identified for the acute phase and past-immunity sera. FCS measurement of VLP-immune complexes could be useful in distinguishing between antibodies present in acute phase or past-immunity sera as well as in titration of the VLPs.

journal_name

Biol Chem

journal_title

Biological chemistry

authors

Toivola J,Michel PO,Gilbert L,Lahtinen T,Marjomäki V,Hedman K,Vuento M,Oker-Blom C

doi

10.1515/BC.2004.011

keywords:

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

87-93

issue

1

eissn

1431-6730

issn

1437-4315

journal_volume

385

pub_type

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