Comparative proteomics investigation of central carbon metabolism in Euglena gracilis grown under predominantly phototrophic, mixotrophic and heterotrophic cultivations

被引：21

作者：

Hasan, Mafruha T. ^{[1
,2
,3
]}

Sun, Angela ^{[1
,2
,3
]}

Khatiwada, Bishal ^{[1
,2
,3
]}

McQuade, Leon ^{[4
]}

Mirzaei, Mehdi ^{[1
,2
,3
,4
]}

Te'o, Junior ^{[2
,5
]}

Hobba, Graham ^{[2
,6
]}

Sunna, Anwar ^{[1
,2
,3
]}

Nevalainen, Helena ^{[1
,2
,3
]}

机构：

[1] Macquarie Univ, Dept Mol Sci, Sydney, NSW, Australia

[2] ARC, MQ Ind Transformat Training Ctr ITTC Mol Technol, Canberra, ACT, Australia

[3] Macquarie Univ, Biomol Discovery & Design Res Ctr, Sydney, NSW, Australia

[4] Macquarie Univ, Australian Proteome Anal Facil, Sydney, NSW, Australia

[5] Queensland Univ Technol, Sch Earth Environm & Biol Sci, Brisbane, Qld, Australia

[6] Agritechnol Pty Ltd, Borenore, NSW, Australia

来源：

ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS | 2019年 / 43卷

基金：

澳大利亚研究理事会;

关键词：

Carbon metabolism; Glucokinase; Paramylon synthesis; Post-transcriptional regulation; Euglena gracilis proteomics; NUCLEUS-ENCODED GENES; 2-OXOGLUTARATE DECARBOXYLASE; PHOSPHOENOLPYRUVATE-CARBOXYKINASE; POSTTRANSCRIPTIONAL REGULATION; CHLOROPLAST PROTEINS; ALPHA-TOCOPHEROL; AMINO-ACIDS; LIGHT; PARAMYLON; PURIFICATION;

D O I：

10.1016/j.algal.2019.101638

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：

Euglena gracilis can use a wide range of organic carbon sources, as well as CO2 from the atmosphere. This metabolic versatility is owed to the genome of E. gracilis that can encode a wide range of enzymes. Many of these enzymes are regulated post-transcriptionally, allowing the cells to adapt quickly to changes in their surroundings. Here we investigated the effect of predominantly phototrophic (PT), mixotrophic (MT) and heterotrophic (HT) cultivation on central carbon metabolism in E. gracilis Z using label-free shotgun proteomics. Differential expression between isozymes was observed based on the cultivation condition. A hexokinase enzyme identified in the published transcriptome was not detected in the proteome. Instead, a high-specificity glucokinase appeared to conduct the first step of glycolysis. Two candidates for paramylon synthase were identified (EgGSL1 and EgGSL2), of which the predominant EgGSL2 protein was detected across all growth conditions, while EgGSL1 was only detected in the presence of light (PT and MT cultivations). Proteomic analysis revealed that the oxidative pentose phosphate pathway also plays a key role in glucose metabolism under MT and HT cultivation. Some chloroplast-encoded proteins and enzymes of the Calvin pathway were detected under HT cultivation indicating regulation at the post-translational level. The carbon metabolic pathways investigated here in terms of proteomic changes provide new information, as well as validate data presented elsewhere with quantitative proteomics, adding to the existing knowledge of metabolism in E. gracilis. Putative functional annotations of several proteins that were previously unidentified are also provided.

引用

页数：11