How to read a codon table
This presentation is the property of its rightful owner.
Sponsored Links
1 / 9

How to read a codon table PowerPoint PPT Presentation


  • 142 Views
  • Uploaded on
  • Presentation posted in: General

How to read a codon table. Use in protein synthesis for translating the mRNA code into amino acid sequence. You need a sequence of mRNA. Where does this come from?. From the transcription of DNA --> mRNA. Example:. DNA sequence: TAC GGA CAT AAC ACC TGC ATC

Download Presentation

How to read a codon table

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


How to read a codon table

How to read a codon table

Use in protein synthesis for translating the mRNA code into amino acid sequence


You need a sequence of mrna

You need a sequence of mRNA

  • Where does this come from?

From the transcription

of DNA --> mRNA

Example:

DNA sequence: TAC GGA CAT AAC ACC TGC ATC

mRNA sequence: AUG CCU GUA UUG UGG ACG UAG


Transcription

Transcription

  • mRNA sequence leaves the nucleus and travels to the cytoplasm to a free floating ribosome or to the rough ER.

  • It will attach to the ribosome and begin the second step of protein synthesis, translation.


Translation

Translation

  • mRNA is read as a series of codons (three letters) within the ribosome.

  • tRNA molecules have an anticodon sequence of letters that are complements to the mRNA

    ex: mRNA CGA UCC (codon)

    tRNA GCU AGG (anticodon)


So now we get to the codon table

So now we get to the codon table!

  • Locate the first letter of your codon using the left side of the table.

  • Ex. AUG

  • look for the A


How to read a codon table

  • Now move to the second letter of your codon which is ‘U’

  • Look at the top of the table where you see the title ‘2nd letter’

  • Find the letter ‘U’ and follow it down until it intersects with the letter ‘A’ from the left side.

  • You should see four amino acids (isoleucine, isoleucine, isoleucine, and (start) methionine.


How to read a codon table

  • Down to the last letter of the codon!

  • Look to the right hand side for the third letter. Find the letter ‘G’ which will intersect with the box that had our four choices.

  • Move your finger from the ‘G’ on the left over to the left and you should land on ….. Methionine (start)

  • Yes you did it!!!

  • Now try another codon


Try the codon cac

Try the codon CAC

Don’t peek until you come up with your answer!

Did you get the amino acid ‘histidine’?


What do these codons have to do with proteins

What do these codons have to do with proteins?

  • Each codon represents an amino acid that will eventually form a protein that is used within a cell.

  • Proteins are made up of hundreds of amino acids in a specific sequence.

  • When they get “out of order’ a mutation occurs.

Long string of amino acids will form