Engineering stable cytoplasmic intrabodies with designed specificity.
J Mol Biol
; 330(2): 323-32, 2003 Jul 04.
Article
en En
| MEDLINE
| ID: mdl-12823971
ABSTRACT
Many attempts have been made to develop antibody fragments that can be expressed in the cytoplasm ("intrabodies") in a stable and functional form. The recombinant antibody fragment scFv(F8) is characterised by peculiarly high in vitro stability and functional folding in both prokaryotic and eukaryotic cytoplasm. To dissect the relative contribution of different scFv(F8) regions to cytoplasmic stability and specificity we designed and constructed five chimeric molecules (scFv-P1 to P5) in which several groups of residues important for antigen binding in the poorly stable anti-hen egg lysozyme (HEL) scFv(D1.3) were progressively grafted onto the scFv(F8) scaffold. All five chimeric scFvs were expressed in a soluble form in the periplasm and cytoplasm of Escherichia coli. All the periplasmic oxidised forms and the scFv(P3) extracted from the cytoplasm in reducing conditions had HEL binding affinities essentially identical (K(d)=15nM) to that of the cognate scFv(D1.3) fragment (K(d)=16nM). The successful grafting of the antigen binding properties of D1.3 onto the scFv(F8) opens the road to the exploitation of this molecule as a scaffold for the reshaping of intrabodies with desired specificities to be targeted to the cytoplasm.
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Banco de datos:
MEDLINE
Asunto principal:
Región Variable de Inmunoglobulina
/
Ingeniería de Proteínas
/
Citoplasma
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Año:
2003
Tipo del documento:
Article