A 36-residue peptide contains all of the information required for 7B2-mediated activation of prohormone convertase 2

A 36-residue peptide contains all of the information required for 7B2-mediated activation of prohormone convertase 2

Author Muller, L. Google Scholar
Zhu, P. M. Google Scholar
Juliano, Maria Aparecida Autor UNIFESP Google Scholar
Juliano, Luiz Autor UNIFESP Google Scholar
Lindberg, I Google Scholar
Institution Louisiana State Univ
Universidade Federal de São Paulo (UNIFESP)
Abstract The prohormone convertases (PCs) are serine proteinases responsible for the processing of secretory protein precursors. PC2 is the only member of this family whose activation requires intracellular interaction with a helper protein, the neuroendocrine protein 7B2, in order to gain a better understanding of the mechanism of proPC2 activation, we have characterized the structural determinants of 7B2 required for proPC2 activation. We had already identified a proline-rich binding determinant in the 21-kDa domain, the portion of 7B2 responsible for proPC2 activation. We have now investigated the function of the weakly conserved amino-terminal portion of 21-kDa 7B2 by sequential deletions. Mutant proteins were analyzed in four assays: binding to proPC2, facilitation of proPC2 maturation, and activation of proPC2 in vivo and in vitro. We found that the aminoterminal half of 7B2 is not involved in proPC2 activation, and we identified an active 36-residue peptide that contains the previously characterized proline-rich sequence as well as an alpha-helix and the only disulfide bond of 7B2. Mutation of the cu-helix and of the cysteines demonstrated that these determinants are absolutely required for PC2 activation, Thus, the 186-residue full-length 7B2 rat protein can be functionally reduced to an internal segment of only 36 residues.
Language English
Date 1999-07-23
Published in Journal of Biological Chemistry. Bethesda: Amer Soc Biochemistry Molecular Biology Inc, v. 274, n. 30, p. 21471-21477, 1999.
ISSN 0021-9258 (Sherpa/Romeo, impact factor)
Publisher Amer Soc Biochemistry Molecular Biology Inc
Extent 21471-21477
Origin http://dx.doi.org/10.1074/jbc.274.30.21471
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000081613100103
URI http://repositorio.unifesp.br/handle/11600/26114

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