| 词条 | Regulon |
| 释义 |
In molecular genetics, a regulon is a group of genes that are regulated as a unit, generally controlled by the same regulatory gene that expresses a protein acting as a repressor or activator. This terminology is generally, although not exclusively, used in reference to prokaryotes, whose genomes are often organized into operons; the genes contained within a regulon are usually organized into more than one operon at disparate locations on the chromosome.[1] Applied to eukaryotes, the term refers to any group of non-contiguous genes controlled by the same regulatory gene.[2] A modulon is a set of regulons or operons that are collectively regulated in response to changes in overall conditions or stresses, but may be under the control of different or overlapping regulatory molecules. The term stimulon is sometimes used to refer to the set of genes whose expression responds to specific environmental stimuli.[1] ExamplesCommonly studied regulons in bacteria are those involved in response to stress such as heat shock. The heat shock response in E. coli is regulated by the sigma factor σ32 (RpoH), whose regulon has been characterized as containing at least 89 open reading frames.[3] Regulons involving virulence factors in pathogenic bacteria are of particular research interest; an often-studied example is the phosphate regulon in E. coli, which couples phosphate homeostasis to pathogenicity through a two-component system.[4] Regulons can sometimes be pathogenicity islands.[5] The Ada regulon in E. coli is a well-characterized example of a group of genes involved in the adaptive response form of DNA repair.[6] Quorum sensing behavior in bacteria is a commonly cited example of a modulon or stimulon,[7] though some sources describe this type of intercellular auto-induction as a separate form of regulation.[1]EvolutionChanges in the regulation of gene networks are a common mechanism for prokaryotic evolution. An example of the effects of different regulatory environments for homologous proteins is the DNA-binding protein OmpR, which is involved in response to osmotic stress in E. coli but is involved in response to acidic environments in the close relative Salmonella Typhimurium.[8] References1. ^1 2 {{cite book|last1=Schlegel|first1=edited by Joseph W. Lengeler, Gerhart Drews, Hans G.|title=Biology of the prokaryotes|date=1999|publisher=Thieme|location=Stuttgart|isbn=9781444313307|pages=498–9|chapter=Global Regulatory Networks and Signal Transduction Pathways}} 2. ^{{MeSH name|Regulon}} 3. ^{{cite journal|last1=Nonaka|first1=G|last2=Blankschien|first2=M|last3=Herman|first3=C|last4=Gross|first4=CA|last5=Rhodius|first5=VA|title=Regulon and promoter analysis of the E. coli heat-shock factor, sigma32, reveals a multifaceted cellular response to heat stress.|journal=Genes & Development|date=1 July 2006|volume=20|issue=13|pages=1776–89|pmid=16818608|doi=10.1101/gad.1428206|pmc=1522074}} 4. ^{{cite journal|last1=Lamarche|first1=MG|last2=Wanner|first2=BL|last3=Crépin|first3=S|last4=Harel|first4=J|title=The phosphate regulon and bacterial virulence: a regulatory network connecting phosphate homeostasis and pathogenesis.|journal=FEMS Microbiology Reviews|date=May 2008|volume=32|issue=3|pages=461–73|pmid=18248418|doi=10.1111/j.1574-6976.2008.00101.x}} 5. ^{{cite journal|last1=Hacker|first1=J|last2=Blum-Oehler|first2=G|last3=Mühldorfer|first3=I|last4=Tschäpe|first4=H|title=Pathogenicity islands of virulent bacteria: structure, function and impact on microbial evolution.|journal=Molecular Microbiology|date=March 1997|volume=23|issue=6|pages=1089–97|pmid=9106201|doi=10.1046/j.1365-2958.1997.3101672.x}} 6. ^{{cite journal|last1=Landini|first1=P|last2=Volkert|first2=MR|title=Regulatory responses of the adaptive response to alkylation damage: a simple regulon with complex regulatory features.|journal=Journal of Bacteriology|date=December 2000|volume=182|issue=23|pages=6543–9|pmid=11073893|doi=10.1128/jb.182.23.6543-6549.2000|pmc=111391}} 7. ^{{cite book|author1=Michael Hecker|author2=Stefan Müllner|title=Proteomics of Microorganisms: Fundamental Aspects and Application|url=https://books.google.com/books?id=bclwDYPbJj8C&pg=PA66|date=18 July 2003|publisher=Springer Science & Business Media|isbn=978-3-540-00546-9|pages=66}} 8. ^{{cite journal|last1=Quinn|first1=HJ|last2=Cameron|first2=AD|last3=Dorman|first3=CJ|title=Bacterial regulon evolution: distinct responses and roles for the identical OmpR proteins of Salmonella Typhimurium and Escherichia coli in the acid stress response.|journal=PLOS Genetics|date=March 2014|volume=10|issue=3|pages=e1004215|pmid=24603618|doi=10.1371/journal.pgen.1004215|pmc=3945435}} 1 : Gene expression |
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