title: Evolution of disorder in Mediator complex and its functional relevance.
abstract: Mediator, an important component of eukaryotic transcriptional machinery, is a huge multisubunit complex. Though the complex is known to be conserved across all the eukaryotic kingdoms, the evolutionary topology of its subunits has never been studied. In this study, we profiled disorder in the Mediator subunits of 146 eukaryotes belonging to three kingdoms viz., metazoans, plants and fungi, and attempted to find correlation between the evolution of Mediator complex and its disorder. Our analysis suggests that disorder in Mediator complex have played a crucial role in the evolutionary diversification of complexity of eukaryotic organisms. Conserved intrinsic disordered regions (IDRs) were identified in only six subunits in the three kingdoms whereas unique patterns of IDRs were identified in other Mediator subunits. Acquisition of novel molecular recognition features (MoRFs) through evolution of new subunits or through elongation of the existing subunits was evident in metazoans and plants. A new concept of 'junction-MoRF' has been introduced. Evolutionary link between CBP and Med15 has been provided which explain the evolution of extended-IDR in CBP from Med15 KIX-IDR junction-MoRF suggesting role of junction-MoRF in evolution and modulation of protein-protein interaction repertoire. This study can be informative and helpful in understanding the conserved and flexible nature of Mediator complex across eukaryotic kingdoms.
authors.affiliation: Plant Mediator Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi 110067, India.
authors.forename: Malini
authors.initials: M
authors.lastname: Nagulapalli
authors.affiliation: Plant Mediator Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi 110067, India.
authors.forename: Sourobh
authors.initials: S
authors.lastname: Maji
authors.affiliation: Plant Mediator Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi 110067, India.
authors.forename: Nidhi
authors.initials: N
authors.lastname: Dwivedi
authors.affiliation: Plant Mediator Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi 110067, India.
authors.forename: Pradeep
authors.initials: P
authors.lastname: Dahiya
authors.affiliation: Plant Mediator Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi 110067, India jthakur@nipgr.ac.in.
authors.forename: Jitendra K
authors.initials: JK
authors.lastname: Thakur
mesh_terms: D000595:Amino Acid Sequence / Q000235:genetics*; D002352:Carrier Proteins / Q000235:genetics* / Q000378:metabolism; D017124:Conserved Sequence / Q000235:genetics; D056890:Eukaryota / Q000235:genetics; D019143:Evolution, Molecular; D005998:Glycine / Q000031:analogs & derivatives* / Q000235:genetics / Q000378:metabolism; D056892:Mediator Complex / Q000737:chemistry / Q000235:genetics*; D060066:Protein Interaction Maps / Q000235:genetics; D011758:Pyrroles / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D002352:Carrier Proteins; D056892:Mediator Complex; D011758:Pyrroles; C020723:citrate-binding transport protein; C065762:ST 679; D005998:Glycine