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Isolation and characterization of neutralizing single-chain antibodies against Xenopus mitogen-activated protein kinase kinase from phage display libraries.

Abstract：

:MAP kinase kinase (MAPKK) is a dual specificity protein kinase that phosphorylates and activates MAP kinase in vivo. In this study, four mouse monoclonal single-chain Fv (scFv) antibodies (Y1-6, Y1-7, Y3-6, and Y3-11) that can specifically bind to Xenopus MAPKK were isolated from combinatorial scFv-displaying phage libraries. Three scFv clones (Y1-6, Y1-7, and Y3-6) were shown to efficiently inhibit MAPKK activity in vitro. Point mutation (D98K) at VH-CDR3 of one (Y1-6) of these three clones markedly reduced its neutralizing activity. The wild-type scFv (Y1-6) inhibited the Mos-induced MAP kinase activation and germinal vesicle breakdown when injected into immature Xenopus oocytes, whereas the mutant scFv, Y1-6 (D98K), did not. The three neutralizing scFv clones (Y1-6, Y1-7, and Y3-6) were shown to bind to NH2-terminal residues 1-23 of Xenopus MAPKK, whereas the epitope of a Y3-11 clone with no neutralizing activity was shown to lie between residues 33 and 67 of MAPKK. Furthermore, a synthetic peptide (the N16 peptide) corresponding to residues 2-17 of MAPKK suppressed the neutralizing activity of the wild-type Y1-6, and a rabbit polyclonal antibody against the N16 peptide was found to possess a strong neutralizing activity against MAPKK. These results demonstrate that the neutralizing antibodies characterized here inhibit the kinase activity of MAPKK by binding to the NH2-terminal segment of MAPKK.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Kosako H,Akamatsu Y,Tsurushita N,Lee KK,Gotoh Y,Nishida E

doi

10.1021/bi960956f

subject

Has Abstract

pub_date

1996-10-08 00:00:00

pages

13212-21

issue

40

eissn

0006-2960

issn

1520-4995

pii

bi960956f

journal_volume

35

pub_type

杂志文章

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