Chaetomium thermophilum

Chaetomium thermophilum is a thermophilic filamentous fungus. It grows on dung or compost (rotten organics). It is notable for being a eukaryote with a high temperature tolerance (60 °C). Its optimal growth temperature is 50–55 °C.[1]

Chaetomium thermophilum
Scientific classification
Kingdom:
Fungi
Division:
Ascomycota
Class:
Sordariomycetes
Order:
Sordariales
Family:
Chaetomiaceae
Genus:
Chaetomium
Species:
C. thermophilum
Binomial name
Chaetomium thermophilum
La Touche (1950)

Research

Chaetomium thermophilum is a focus of research at the Biochemistry Department at Heidelberg University, Germany. Since fungi are eukaryotic and not distant from animals they are good models for comparative and easy-to-manipulate research, and in the case of C. thermophilum, it is of special significance. First, given the fact it is thermophilic, proteins derived from this fungus are heat stable and thus easier to work with. Proteins from C. thermophilum are thermophilic and thus better for studies (structural and biochemical) than comparable mesophilic fungi. Studying nuclear pore complex proteins, it was found that protein isolation was more abundant and more soluble than in yeast (yeast proteins precipitate at a lower temperature).[2]

Genome and proteome

The genome of C. thermophilum has been completely sequenced. It spans 28.3 Mb and encodes 7227 predicted protein coding genes.[1][3] Saccharomyces cerevisiae, a model yeast, has 73% protein homology to this fungus.

The proteome of C. thermophilum has been studied and 27 distinct protein communities, including 108 interconnected complexes have been identified.[4]

Model system for identifying higher-order protein interactions
Cryo-electron microscopic image of fractionated lysate from C. thermophilum cellular extracts. Megadalton protein complexes are observed (e.g. the barrel-shaped fatty acid synthase) that are either co-eluting or interacting to form higher-order protein complex assemblies (communities).

The first observation of a metabolon in fatty acid metabolism at high resolution came from cryo-electron microscopic analysis of cellular homogenates from C. thermophilum. Other protein complexes and higher-order interactions were predicted and validated using a novel integration of experimental and computational methods which include proteomics, cross-linking mass spectrometry, computational structural biology and electron microscopy. The cellular homogenates of C. thermophilum were used to derive protein complex structures at high resolution, with purity of the native protein complex < 40%.[4]

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References
  1. Bock, Thomas; Chen, Wei-Hua; Ori, Alessandro; Malik, Nayab; Silva-Martin, Noella; Huerta-Cepas, Jaime; Powell, Sean T.; Kastritis, Panagiotis L.; Smyshlyaev, Georgy (2014-12-16). "An integrated approach for genome annotation of the eukaryotic thermophile Chaetomium thermophilum". Nucleic Acids Research. 42 (22): 13525–13533. doi:10.1093/nar/gku1147. ISSN 0305-1048. PMC 4267624. PMID 25398899.
  2. Insight into Structure and Assembly of the Nuclear Pore Complex by Utilizing the Genome of a Eukaryotic Thermophile
  3. "Genozymes Public Genomes". Genome.fungalgenomics.ca. Retrieved 2014-05-17.
  4. Kastritis, Panagiotis L.; O'Reilly, Francis J.; Bock, Thomas; Li, Yuanyue; Rogon, Matt Z.; Buczak, Katarzyna; Romanov, Natalie; Betts, Matthew J.; Bui, Khanh Huy (2017-07-01). "Capturing protein communities by structural proteomics in a thermophilic eukaryote". Molecular Systems Biology. 13 (7): 936. doi:10.15252/msb.20167412. ISSN 1744-4292. PMC 5527848. PMID 28743795.
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