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Plant Molecular Biology

, Volume 50, Issue 6, pp 925–947 | Cite as

Multi-protein complexes in eukaryotic gene transcription

  • Ernest Martinez
Article

Abstract

Specific transcription initiation by RNA polymerase II at eukaryotic protein-coding genes involves the cooperative assembly at the core promoter of more than 40 distinct proteins – with a total mass of over 2 MDa – including RNA polymerase II itself and general/basal transcription initiation factors, to form a stable pre-initiation complex (PIC). In vivo, PIC assembly is a major point of regulation by sequence-specific transcription regulators (activators and repressors) and is hindered by the packaging of promoter DNA into nucleosomes and higher order chromatin structures. Genetic and biochemical studies have recently identified a variety of transcription cofactors/co-regulators (coactivators and corepressors) that interact with sequence-specific regulators and/or various components of the general/basal transcription machinery and are essential for regulated transcription. An emerging view from these studies is that regulators must target two types of transcription cofactors: chromatin-modifying/remodeling cofactors and general cofactors that associate with and/or influence the activities of components of the general/basal transcription machinery. The recent biochemical identification and characterization of many different chromatin-modifying and general transcription cofactors has revealed their often complex multi-subunit nature and a previously unsuspected level of structural and functional redundancy. Another emerging theme is the multifunctional nature of chromatin-modifying cofactor complexes that appear to couple gene-specific transcription to other cellular processes.

Keywords

Transcription Initiation Core Promoter Transcription Machinery High Order Chromatin Biochemical Identification 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Ernest Martinez
    • 1
  1. 1.Department of BiochemistryUniversity of CaliforniaRiversideU.S.A

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