Shotgun proteomics of Methanococcus jannaschii and insights into methanogenesis

Journal of Proteome Research
Wenhong ZhuJ R Yates

Abstract

Methanococcus jannaschii is an autotrophic hyperthermophilic archaeon isolated from an oceanic hydrothermal vent. Its primary pathway for energy production is methanogenesis from H2 and CO2. High-throughput Multidimensional Protein Identification Technology based on microcapillary LC/LC/ MS/MS was used to investigate the proteome of M. jannaschii and the methanogenesis pathway in cells grown in complex medium with high H2 supply. A total of 963 proteins have been unambiguously identified. The identified proteins represent approximately 54% of the whole genome of M. jannaschii. About 44% of the identified proteins are either conserved hypothetical or hypothetical proteins. We identified 83-95% of the proteins predicted to be involved in amino acid biosynthesis, cellular processes, central intermediary metabolism, energy metabolism, protein synthesis, transcription, and purine, pyridine, nucleoside, and nucleotide synthesis. Over 40% of these proteins have better than 50% sequence coverage. Approximately 90% of the predicted methanogenesis proteins were detected. In contrast, only 27-37% of predicted hypothetical proteins, proteins involved in transport and binding, and proteins with regulatory functions were identified. High pep...Continue Reading

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