alexa Functional inhibition of transitory proteins by intrabody-mediated retention in the endoplasmatic reticulum.
Molecular Biology

Molecular Biology

Journal of Cell Science & Therapy

Author(s): Bldicke T, Somplatzki S, Sergeev G, Mueller PP

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Abstract Intrabodies are recombinantly expressed intracellular antibody fragments that can be used to specifically bind and inhibit the function of cellular proteins of interest. Intrabodies can be targeted to various cell compartments by attaching an appropriate localization peptide sequence to them. An efficient strategy with a high success rate is to anchor intrabodies in the endoplasmatic reticulum where they can inhibit transitory target proteins by binding and preventing them to reach their site of action. Intrabodies can be assembled from antibody gene fragments from various sources into dedicated expression vectors. Conventionally, antibody cDNA sequences are derived from selected hybridoma cell clones that express antibodies with the desired specificity. Alternatively, appropriate clones can be isolated by affinity selection from an antibody in vitro display library. Here an evaluation of endoplasmatic reticulum targeted intrabodies with respect to other knockdown approaches is given and the characteristics of various intrabody expression vectors are discussed. A step by step protocol is provided that was repeatedly used to construct intrabodies derived from diverse antibody isotypes producing hybridoma cell clones. The inactivation of the cell surface receptor neural cell adhesion molecule (NCAM) by a highly efficacious novel endoplasmatic reticulum-anchored intrabody is demonstrated. Copyright © 2011 Elsevier Inc. All rights reserved. This article was published in Methods and referenced in Journal of Cell Science & Therapy

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