title: Core proteome of the minimal cell: comparative proteomics of three mollicute species.
abstract: Mollicutes (mycoplasmas) have been recognized as highly evolved prokaryotes with an extremely small genome size and very limited coding capacity. Thus, they may serve as a model of a 'minimal cell': a cell with the lowest possible number of genes yet capable of autonomous self-replication. We present the results of a comparative analysis of proteomes of three mycoplasma species: A. laidlawii, M. gallisepticum, and M. mobile. The core proteome components found in the three mycoplasma species are involved in fundamental cellular processes which are necessary for the free living of cells. They include replication, transcription, translation, and minimal metabolism. The members of the proteome core seem to be tightly interconnected with a number of interactions forming core interactome whether or not additional species-specific proteins are located on the periphery. We also obtained a genome core of the respective organisms and compared it with the proteome core. It was found that the genome core encodes 73 more proteins than the proteome core. Apart of proteins which may not be identified due to technical limitations, there are 24 proteins that seem to not be expressed under the optimal conditions.
authors.affiliation: Scientific Research Institute of Physical-Chemical Medicine, Federal Bio-Medical Agency of Russia, Moscow, Russia. herr.romanoff@gmail.com
authors.forename: Gleb Y
authors.initials: GY
authors.lastname: Fisunov
authors.forename: Dmitry G
authors.initials: DG
authors.lastname: Alexeev
authors.forename: Nicolay A
authors.initials: NA
authors.lastname: Bazaleev
authors.forename: Valentina G
authors.initials: VG
authors.lastname: Ladygina
authors.forename: Maria A
authors.initials: MA
authors.lastname: Galyamina
authors.forename: Ilya G
authors.initials: IG
authors.lastname: Kondratov
authors.forename: Nadezhda A
authors.initials: NA
authors.lastname: Zhukova
authors.forename: Marina V
authors.initials: MV
authors.lastname: Serebryakova
authors.forename: Irina A
authors.initials: IA
authors.lastname: Demina
authors.forename: Vadim M
authors.initials: VM
authors.lastname: Govorun
mesh_terms: D001426:Bacterial Proteins / Q000378:metabolism*; D016680:Genome, Bacterial / Q000235:genetics; D009174:Mycoplasma / Q000166:cytology* / Q000235:genetics / Q000378:metabolism*; D016366:Open Reading Frames / Q000235:genetics; D011485:Protein Binding; D020543:Proteome / Q000378:metabolism*; D040901:Proteomics / Q000379:methods*; D016372:RNA, Antisense / Q000378:metabolism; D013045:Species Specificity; D014158:Transcription, Genetic
chemical_list: D001426:Bacterial Proteins; D020543:Proteome; D016372:RNA, Antisense