High expression of human carboxypeptidase M in Pichia pastoris. Purification and partial characterization

High expression of human carboxypeptidase M in Pichia pastoris. Purification and partial characterization

Author Craveiro, Rogerio Bastos Autor UNIFESP Google Scholar
Ramalho, João Daivison Silva Autor UNIFESP Google Scholar
Chagas, Jair Ribeiro Autor UNIFESP Google Scholar
Wang, Pamella Huey Mei Autor UNIFESP Google Scholar
Casarini, Dulce Elena Autor UNIFESP Google Scholar
Pesquero, Jorge Luiz Autor UNIFESP Google Scholar
Araujo, Ronaldo Carvalho Autor UNIFESP Google Scholar
Pesquero, João Bosco Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Univ Mogi Cruzes
Universidade Federal de Minas Gerais (UFMG)
Abstract Carboxypeptidase M (CPM) is an extracellular glycosylphosphatidylinositol-anchored membrane glycoprotein, which removes the C-terminal basic residues, lysine and arginine, from peptides and proteins at neutral pH. CPM plays an important role in the control of peptide hormones and growth factor activity on the cell surface. the present study was carried out to clone and express human CPM in the yeast Pichia pastoris in order to evaluate the importance of this enzyme in physiological and pathological processes. the cDNA for the enzyme was amplified from total placental RNA by RT-PCR and cloned in the vector pPIC9, which uses the methanol oxidase promoter and drives the expression of high levels of heterologous proteins in P. pastoris. the cpm gene, after cloning and transfection, was integrated into the yeast genome, which produced the active protein. the recombinant protein was secreted into the medium and the enzymatic activity was measured using the fluorescent substrate dansyl-Ala-Arg. the enzyme was purified by a two-step protocol including gel filtration and ion-exchange chromatography, resulting in a 1753-fold purified active protein (16474 RFU mg protein(-1) min(-1)). This purification protocol permitted us to obtain 410 mg of the purified protein per titer of fermentation medium. SDS-PAGE showed that recombinant CPM migrated as a single band with a molecular mass similar to that of native placental enzyme (62 kDa), suggesting that the expression of a glycosylated protein had occurred. These results demonstrate for the first time the establishment of a method using P. pastoris to express human CPM necessary to the development of specific antibodies and antagonists, and the analysis of the involvement of this peptidase in different physiological and pathological processes.
Keywords kinins
human carboxypeptidase M
recombinant protein
Pichia pastoris
Language English
Date 2006-02-01
Published in Brazilian Journal of Medical and Biological Research. São Paulo: Assoc Bras Divulg Cientifica, v. 39, n. 2, p. 211-217, 2006.
ISSN 0100-879X (Sherpa/Romeo, impact factor)
Publisher Assoc Bras Divulg Cientifica
Extent 211-217
Origin http://dx.doi.org/10.1590/S0100-879X2006000200007
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000235452400007
SciELO ID S0100-879X2006000200007 (statistics in SciELO)
URI http://repositorio.unifesp.br/handle/11600/28713

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