Expression of prostate specific antigen on the surface of a filamentous phage.

Abstract:

:We have constructed two phagemid vectors containing the gene coding for human Prostate Specific Antigen (PSA) translationally fused to a pelB signal sequence and minor coat protein III of phage fd leading to phage particles that carry PSA on their tips. Phages were characterized by Western blotting and by panning, using biotinylated monoclonal anti-PSA antibodies immobilized onto streptavidin-coated microtitration wells. Binding of PSA-phages was 10(2)- to 5 x 10(3)-fold more effective than that of wild-type phages. Trypsin treatment of the phage abolished the specific binding. Competitive panning with different concentrations of added purified PSA demonstrated that binding was PSA specific. Finally, Western-blot analysis confirmed that full-length and shorter degradation products of the fusion between PSA and protein III were visible as probed with anti-PSA antibody.

authors

Eerola R,Saviranta P,Lilja H,Pettersson K,Lövgren T,Karp M

doi

10.1006/bbrc.1994.1599

subject

Has Abstract

pub_date

1994-05-16 00:00:00

pages

1346-52

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(84)71599-3

journal_volume

200

pub_type

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