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Polysomes and polypeptide elongation Sun Hwa Dong.

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Presentation on theme: "Polysomes and polypeptide elongation Sun Hwa Dong."— Presentation transcript:

1 Polysomes and polypeptide elongation Sun Hwa Dong

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3 Polysomes (=Polyribosomes) Group of ribosomes bound to a mRNA Read one strand of mRNA simultaneously To translate, each ribosome follows repeated steps After each repetition, one amino acid is added to elongating polypeptide

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5 Polypeptide Elongation 1) A tRNA – amino acid approaches the ribosome and binds at A site. 2) 2 tRNAs can be at a ribosome at one time; the anticodons are paired to codons 3) Peptide bond formation attaches the peptide chain to the newly arrived amino acid 4) The ribosomes moves forward; empty tRNA exists from the E site; the next amino acid-tRNA complex is approaching the ribosome

6 Vocabulary Polysomes mRNA, tRNA Amino acid Codon, anticodon Polypeptide elongation

7 Bibliography Study guide pg 64 http://classes.midlandstech.edu/carterp/Cou rses/bio101/chap14/chap14.htm http://classes.midlandstech.edu/carterp/Cou rses/bio101/chap14/chap14.htm http://www.emc.maricopa.edu/faculty/farab ee/biobk/biobookprotsyn.html http://www.emc.maricopa.edu/faculty/farab ee/biobk/biobookprotsyn.html


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