TrP ATTENUATION

[sssk38]

WRONG VIDEO

copying from laserindividual: The video shows attenuation and talks about repression.

[laserindividual]

The animation shows attenuation, whilst the narrator speaks of repression, and so the video is misnamed and should be flagged for inaccuracy.

[richdar99]

can u help me with explaining the operation of the trp operon and why is it considered a repressible operon

[karlkarlkarl1234]

This is not attenuation it is repression.

[agathman]

Pretty diagram of attenuation, but the voice-over doesn't match what's happening. There's no explanation of attenuation at all.

[RamirezHD]

not recommended needs much more detail...

[Hkanbar15]

Please change the title, its just not appropriate

[M4KS1M]

no real explanation of the attenuation, just the repressor-polymerase dynamics :(

[farajvip]

how about the attenuator ????

[meme2342]

doesn't seem to go into attenuation in any detail...

shame, as that's what i was looking for!

[fongsiewli]

Lovely vid! Thank you!!!

[leticianavarro123]

DIE!!!

[LeeDiddy990]

my mistake its the other way. the greatman 99 was right sorry if I confused in any way it was 2 a.m. when I wrote that.

[IluvJesus610]

thank u so much!! I really hate biology, but this is very helpful

[cutiestar300]

great video! thank you very much!

[LeeDiddy990]

true a loop will form between the three and four stems of the t-rna when there is no trytophan present resulting in early termination of transcription. however, if tryptophan is present then there is an interaction between the two and three stems and transcription can continue.

[xEternalx]

now im confused. LeeDiddy990 and thegreatman99 contradicts each other.

[Roseurbane]

@xEternalx thegreatman99 got it right. LeeDiddy990 mixed up the concentration of tryptophan. Low concentration forms the 2-3 loop (trasncription continues, more tryptophan produced) while high forms the 3-4 loop (stops transcription, no more tryptophan is produced).

Hope this helps! :)

[thegreatman99]

Something the video isn't to clear about which you should remember is that the 3-4 stem loop forms only if trp is present. This prevents transcription from occurring. If there's no trp at all, the 2-3 stem loop occurs instead and so the 3-4 stem loop can't form since the 3 is already occupied. This allows transcription to occur as the 2-3 stem loop doesn't block transcription....only the 3-4 does.

Nevertheless the video helped me, thanks!

[martayd88]

lol all sugar operons are polycistronic

[blessedboy1986]

isn't it funny??

[blessedboy1986]

isn't it so funny??

[mozart20dlubos]

lac operon is an example of polycistrony in prokaryotes.