Bio Question

[kov82]

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An operator is a sequence of DNA that a repressor binds to and prevents transcription, a silencer is a sequence of DNA that a repressor protein binds to that prevents transcription, so is an operator a silencer?

 

[Lemons]

Here is what I found, hopefully someone currently taking Biochem. can give us some input.

"the alpha 2 operator functions as a silencer element"
Plus, Silencers can be found in an Operon region of DNA
Repressors bind to Silencers
Repressors bind to Operators

So a Silencer is a type of Operator?

Sources: http://www.google.com/search?hl=en&rlz=1C1CHMB_enUS314US314&q=silencer+type+of+operator&btnG=Search
http://www.google.com/search?hl=en&...&q=are+silencers++type+of+operons&btnG=Search
http://www.google.com/search?hl=en&rlz=1C1CHMB_enUS314US314&q=silencer+repressor&btnG=Search

 

[bigstix808]

An operator is a sequence of DNA that a repressor binds to and prevents transcription, a silencer is a sequence of DNA that a repressor protein binds to that prevents transcription, so is an operator a silencer?

an operator is a sequence of DNA that is part of an operon found in PROkaryotic DNA. if the operator is free, transcription will take place. if repressor (a protein) is bound to operator - transcription is haulted


a silencer is a sequence of DNA found on EUkaryotic that transcription factors can bind to in order to prevent transcription. eukaryotic DNA also has enhancer regions that do the exact opposite - promote trancription. eukaryotes do not use operons. they use promotor sequences (which attracts RNA polymerase) and termination sequences (stops transcription) along with all the assortment of transcription factors (other proteins -> lots of em 🙂)



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