Mutation of the homologue of GDP-mannose pyrophosphorylase alters cell wall structure, protein glycosylation and secretion in Hansenula polymorpha.
A Hansenula polymorpha mutant with enhanced ability to secrete a heterologous protein has been isolated. The mutation defines a gene, designated OPU24, which encodes a protein highly homologous to GDP-mannose pyrophosphorylase Psa1p/Srb1p/Vig9p of Saccharomyces cerevisiae and CaSrb1p of Candida albicans. The opu24 mutant manifests phenotypes similar to those of S. cerevisiae mutants depleted for GDP-mannose, such as cell wall fragility and defects in N- and O-glycosylation of secreted proteins. The influence of the opu24 mutation on endoplasmic reticulum-associated protein degradation is discussed. The GenBank Accession No. for the OPU24 sequence is AF234177.
Agaphonov
M O
MO
Institute of Experimental Cardiology, Cardiology Research Centre, 3rd Cherepkovskaya Street 15A, Moscow 121552, Russia. molgen@cardio.ru
Packeiser
A N
AN
Chechenova
M B
MB
Choi
E S
ES
Ter-Avanesyan
M D
MD
D000595:Amino Acid Sequence; D001483:Base Sequence; D002473:Cell Wall / Q000378:metabolism; D003001:Cloning, Molecular; D004591:Electrophoresis, Polyacrylamide Gel; D005656:Fungal Proteins / Q000378:metabolism; D006031:Glycosylation; D008854:Microscopy, Electron; D008969:Molecular Sequence Data; D009154:Mutation; D009713:Nucleotidyltransferases / Q000235:genetics* / Q000502:physiology; D010843:Pichia / Q000201:enzymology / Q000235:genetics* / Q000502:physiology; D014568:Urokinase-Type Plasminogen Activator / Q000096:biosynthesis / Q000378:metabolism
D005656:Fungal Proteins; D009713:Nucleotidyltransferases; C026917:mannose 1-phosphate guanylyltransferase; D014568:Urokinase-Type Plasminogen Activator