Linked Life Data

9569602

Source:http://linkedlifedata.com/resource/pubmed/id/9569602

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
1998-5-29
pubmed:abstractText
New secretory signals and strategies can be attempted to improve the secretion of heterologous proteins of biotechnological interest which encounter difficulties being exported in yeast. The GGPI gene of Saccharomyces cerevisiae codes for a 125 kDa glycoprotein transported through the secretory pathway and anchored to the plasma membrane by means of a glycosylphosphatidylinositol. The regions coding for the secretory signal or also for the first 46 amino acids were tested for efficiency in secretion by fusion to the lacZ gene of Escherichia coli resulting in the synthesis of the endoplasmic reticulum-targeted 1-22- and 1-68-GgpIp/beta-gal hybrids. A cytoplasmic form was also examined. The 1-22 beta gal is partially transported to the cell surface and in the medium in an unglycosylated form. The 1-68 beta gal is completely retained in the intracellular membranes and is N-glycosylated in the GgpIp moiety. The amount of hybrid protein produced is similar and independent from its targeted site, suggesting that translocation through endoplasmic reticulum is not a limiting step, whereas the amount of active enzyme is from 50 to 80% lower for the endoplasmic reticulum forms compared with the cytoplasmic form. BiP/Kar2p putative precursor is accumulated in cells expressing the endoplasmic reticulum-targeted forms but not in those producing the cytosolic beta-galactosidase or over-expressing an endogenous secretory protein. Thus, glycosylation and abnormal folding rather than over-expression are among the factors responsible for the decreased activity and exit of beta-galactosidase from the endoplasmic reticulum and for induction of BiP. The results obtained indicate that the sole secretory signal of GgpIp is suitable to drive secretion of foreign products with complex folding and point to the importance of the endoplasmic reticulum quality control in the secretion of heterologous proteins in yeast.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0885-4513
pubmed:author
pubmed:issnType
Print
pubmed:volume
27 ( Pt 2)
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
81-8
pubmed:dateRevised
2009-5-18
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Expression and secretion of beta-galactosidase in Saccharomyces cerevisiae using the signal sequences of GgpI, the major yeast glycosylphosphatidylinositol-containing protein.
pubmed:affiliation
Dipartimento di Fisiologia e Biochimica Generali, Università degli Studi di Milano, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't