Mutation of the protein-O-mannosyltransferase enhances secretion of the human urokinase-type plasminogen activator in Hansenula polymorpha

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Title
Mutation of the protein-O-mannosyltransferase enhances secretion of the human urokinase-type plasminogen activator in Hansenula polymorpha
Author(s)
M O Agaphonov; S S Sokolov; N V Romanova; Jung Hoon Sohn; So Young Kim; T S Kalebina; Eui Sung Choi; M D Ter-Avanesyan
Bibliographic Citation
Yeast, vol. 22, no. 13, pp. 1037-1047
Publication Year
2005
Abstract
Human urokinase-type plasminogen activator (uPA) is poorly secreted and aggregates in the endoplasmic reticulum of yeast cells due to inefficient folding. A screen for Hansenula polymorpha mutants with improved uPA secretion revealed a gene encoding a homologue of the Saccharomyces cerevisiae protein-O-mannosyltransferase Pmt1p. Expression of the H. polymorpha PMT1 gene (HpPMT1) abolished temperature sensitivity of the S. cerevisiae pmt1 pmt2 double mutant. As in S. cerevisiae, inactivation of the HpPMT1 gene affected electrophoretic mobility of the O-glycosylated protein, extracellular chitinase. In contrast to S. cerevisiae, disruption of HpPMT1 alone caused temperature sensitivity. Inactivation of the HpPMT1 gene decreased intracellular aggregation of uPA, suggesting that enhanced secretion of uPA was due to improvement of its folding in the endoplasmic reticulum. Unlike most of the endoplasmic reticulum membrane proteins, HpPmt1p possesses the C-terminal KDEL retention signal. The GenBank Accession No. for the H. polymorpha PMT1 sequence is AY701415.
Keyword
Endoplasmic reticulumHansenula polymorphaO-mannosylationProtein foldingProtein glycosylationProtein secretion
ISSN
0749-503X
Publisher
Wiley
DOI
http://dx.doi.org/10.1002/yea.1297
Type
Article
Appears in Collections:
Synthetic Biology and Bioengineering Research Institute > Synthetic Biology Research Center > 1. Journal Articles
Division of Bio Technology Innovation > BioProcess Engineering Center > 1. Journal Articles
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