Topological assignment of the N-terminal extension of plasma gelsolin to the gelsolin surface

Fock U, Jockusch BM, Schubertt WD, Hinssen H (2005)
BIOCHEMICAL JOURNAL 385(3): 659-665.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Abstract / Bemerkung
The actin-binding protein gelsolin is highly conserved in vertebrates and exists in two isoforms, a cytoplasmic and an extracellular variant, generated by alternative splicing. In mammals, these isoforms differ only by an N-terminal extension in plasma gelsolin. a short sequence of up to 25 amino acids. Cells and tissues may contain both variants, as plasma gelsolin is secreted by many cell types. The tertiary structure of equine plasma gelsolin has been elucidated, but without any information on the N-terminal extension. In this paper, we present topographical data on the N terminal extension, derived using a biochemical and immunological approach. For this purpose, a monoclonal antibody was generated that exclusively recognizes cytoplasmic gelsolin but not the extracellular variant and thus allows isoform-specific immunodetection and quantification of cytoplasmic gelsolin in the presence of plasma gelsolin. Using limited proteolysis and pepscan analysis, we mapped the binding epitope and localized it within two regions in segment I of the cytoplasmic gelsolin sequence: Tyr(34)-Ile(45) and Leu(64)-Ile(78). In the tertiary structure of the cytoplasmic variant, these sequences are mutually adjacent and located in the proximity of the N-terminus. We therefore conclude that the binding site of the antibody is covered by the N-terminal extension in plasma gelsolin and thus sterically hinders antibody binding. Our results allow for a topological model of the N-terminal extension on the surface of the gelsolin molecule, which was unknown previously.
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Zeitschriftentitel
BIOCHEMICAL JOURNAL
Band
385
Ausgabe
3
Seite(n)
659-665
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Fock U, Jockusch BM, Schubertt WD, Hinssen H. Topological assignment of the N-terminal extension of plasma gelsolin to the gelsolin surface. BIOCHEMICAL JOURNAL. 2005;385(3):659-665.
Fock, U., Jockusch, B. M., Schubertt, W. D., & Hinssen, H. (2005). Topological assignment of the N-terminal extension of plasma gelsolin to the gelsolin surface. BIOCHEMICAL JOURNAL, 385(3), 659-665. doi:10.1042/BJ20040875
Fock, U., Jockusch, B. M., Schubertt, W. D., and Hinssen, H. (2005). Topological assignment of the N-terminal extension of plasma gelsolin to the gelsolin surface. BIOCHEMICAL JOURNAL 385, 659-665.
Fock, U., et al., 2005. Topological assignment of the N-terminal extension of plasma gelsolin to the gelsolin surface. BIOCHEMICAL JOURNAL, 385(3), p 659-665.
U. Fock, et al., “Topological assignment of the N-terminal extension of plasma gelsolin to the gelsolin surface”, BIOCHEMICAL JOURNAL, vol. 385, 2005, pp. 659-665.
Fock, U., Jockusch, B.M., Schubertt, W.D., Hinssen, H.: Topological assignment of the N-terminal extension of plasma gelsolin to the gelsolin surface. BIOCHEMICAL JOURNAL. 385, 659-665 (2005).
Fock, U, Jockusch, BM, Schubertt, WD, and Hinssen, Horst. “Topological assignment of the N-terminal extension of plasma gelsolin to the gelsolin surface”. BIOCHEMICAL JOURNAL 385.3 (2005): 659-665.

3 Zitationen in Europe PMC

Daten bereitgestellt von Europe PubMed Central.

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