Genome, secretome and glucose transport highlight unique features of the protein production host Pichia pastoris

被引:164
作者
Mattanovich, Diethard [1 ,2 ]
Graf, Alexandra [1 ,2 ]
Stadlmann, Johannes [3 ]
Dragosits, Martin [1 ]
Redl, Andreas [1 ,2 ]
Maurer, Michael [1 ,2 ]
Kleinheinz, Martin [1 ]
Sauer, Michael [1 ,2 ]
Altmann, Friedrich [3 ]
Gasser, Brigitte [1 ]
机构
[1] Univ Nat Resources & Appl Life Sci, Dept Biotechnol, Vienna, Austria
[2] Univ Appl Sci FH Campus Wien, Sch Bioengn, Vienna, Austria
[3] Univ Nat Resources & Appl Life Sci, Dept Chem, Vienna, Austria
基金
奥地利科学基金会;
关键词
SACCHAROMYCES-CEREVISIAE; SIGNAL PEPTIDES; YEAST; IDENTIFICATION; GENES; PREDICTION; EXPRESSION; SEQUENCES; PATTERNS; PROGRAM;
D O I
10.1186/1475-2859-8-29
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Background: Pichia pastoris is widely used as a production platform for heterologous proteins and model organism for organelle proliferation. Without a published genome sequence available, strain and process development relied mainly on analogies to other, well studied yeasts like Saccharomyces cerevisiae. Results: To investigate specific features of growth and protein secretion, we have sequenced the 9.4 Mb genome of the type strain DSMZ 70382 and analyzed the secretome and the sugar transporters. The computationally predicted secretome consists of 88 ORFs. When grown on glucose, only 20 proteins were actually secreted at detectable levels. These data highlight one major feature of P. pastoris, namely the low contamination of heterologous proteins with host cell protein, when applying glucose based expression systems. Putative sugar transporters were identified and compared to those of related yeast species. The genome comprises 2 homologs to S. cerevisiae low affinity transporters and 2 to high affinity transporters of other Crabtree negative yeasts. Contrary to other yeasts, P. pastoris possesses 4 H+/glycerol transporters. Conclusion: This work highlights significant advantages of using the P. pastoris system with glucose based expression and fermentation strategies. As only few proteins and no proteases are actually secreted on glucose, it becomes evident that cell lysis is the relevant cause of proteolytic degradation of secreted proteins. The endowment with hexose transporters, dominantly of the high affinity type, limits glucose uptake rates and thus overflow metabolism as observed in S. cerevisiae. The presence of 4 genes for glycerol transporters explains the high specific growth rates on this substrate and underlines the suitability of a glycerol/glucose based fermentation strategy. Furthermore, we present an open access web based genome browser http://www.pichiagenome.org.
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页数:13
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