Exchange of regions of the carboxypeptidase Y propeptide. Sequence specificity and function in folding in vivo
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Exchange of regions of the carboxypeptidase Y propeptide. Sequence specificity and function in folding in vivo. / Ramos, C; Winther, Jakob R.
I: European Journal of Biochemistry, Bind 242, Nr. 1, 1996, s. 29-35.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Exchange of regions of the carboxypeptidase Y propeptide. Sequence specificity and function in folding in vivo
AU - Ramos, C
AU - Winther, Jakob R.
PY - 1996
Y1 - 1996
N2 - The propeptide of carboxypeptidase Y from Saccharomyces cerevisiae is important for folding of the enzyme. Previous work [Ramos, C., Winther, J.R. & Kielland-Brandt, M. C. (1994) J. Biol. Chem. 269, 7006-7012] suggested that the sequences essential for in vivo folding were situated in the COOH-proximal third of the propeptide. Concentrating on this region we have investigated the functionality of propeptide variants. Using a random mutagenesis approach we found that two segments can be defined: one in which there is a fairly high tolerance for substitution with unrelated sequences and another that has a more strict requirement for sequence conservation. Nevertheless, an overall lack of requirement for propeptide sequence conservation was found by substitution of the carboxypeptidase Y propeptide with that of a highly divergent propeptide sequence from an otherwise similar carboxypeptidase from Candida albicans. This propeptide was partially functional when combined with carboxypeptidase Y. Analysis of the biosynthesis of the mutant forms of the zymogen showed that a fraction of the molecules proceeded from the endoplasmic reticulum with fairly rapid kinetics, while the rest was degraded.
AB - The propeptide of carboxypeptidase Y from Saccharomyces cerevisiae is important for folding of the enzyme. Previous work [Ramos, C., Winther, J.R. & Kielland-Brandt, M. C. (1994) J. Biol. Chem. 269, 7006-7012] suggested that the sequences essential for in vivo folding were situated in the COOH-proximal third of the propeptide. Concentrating on this region we have investigated the functionality of propeptide variants. Using a random mutagenesis approach we found that two segments can be defined: one in which there is a fairly high tolerance for substitution with unrelated sequences and another that has a more strict requirement for sequence conservation. Nevertheless, an overall lack of requirement for propeptide sequence conservation was found by substitution of the carboxypeptidase Y propeptide with that of a highly divergent propeptide sequence from an otherwise similar carboxypeptidase from Candida albicans. This propeptide was partially functional when combined with carboxypeptidase Y. Analysis of the biosynthesis of the mutant forms of the zymogen showed that a fraction of the molecules proceeded from the endoplasmic reticulum with fairly rapid kinetics, while the rest was degraded.
KW - Amino Acid Sequence
KW - Candida albicans
KW - Carboxypeptidases
KW - Cathepsin A
KW - Molecular Sequence Data
KW - Protein Conformation
KW - Protein Precursors
KW - Protein Structure, Tertiary
KW - Saccharomyces cerevisiae
KW - Sequence Alignment
M3 - Journal article
C2 - 8954149
VL - 242
SP - 29
EP - 35
JO - FEBS Journal
JF - FEBS Journal
SN - 1742-464X
IS - 1
ER -
ID: 43974165