Protein Synthesis - PowerPoint PPT Presentation

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Protein Synthesis
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Protein Synthesis

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  1. Protein Synthesis DNA (genes) to proteins

  2. Turned into Takes code on basepairs Converts it to DNA RNA PROTEIN Protein Synthesis Building protein from DNA in cells

  3. Review Proteins - long chains of amino acids Order of amino acids important because • it determine the shape of protein • which in turn determine the function or job of protein

  4. Protein

  5. Differences w/ DNA • Single strand of nucleotides • nucleotide URACIL replaces thymine

  6. Complimentary bases in RNA 1. cytosine & guanine 2. adenine & uracil

  7. 3 types of RNA in protein syn. • Club shaped - transport amino acids 1. mRNA - messenger RNA • Straight single strand of RNA 2 . tRNA - transfer RNA 3. rRNA - ribosomal RNA - help link amino acids together

  8. 3 steps protein synthesis 1. Transcription - DNA  mRNA 2. Translation - tRNA reads mRNA 3. Linking - amino acids linked together

  9. Step 1 - Transcription code form DNA used to form mRNA • in nucleus • DNA unzipped - base pairs read • Complimentary RNA nucleotides - form mRNA

  10. Step 1 - Transcription

  11. codon Original DNA C A T T C A G A C mRNA formed G U A A G U C U G • Code is stored - groups of 3 nucleotide basepairs - called aCODON

  12. Step 2 - Translation mRNA enters cytoplasm & ribosomes read codons on mRNA

  13. Step 2 - Translation

  14. tRNA - carry amino acids • has special region - ANTI-CODON -- 3 nucleotides • nucleotides complimentary to codons on mRNA • determine amino acid tRNA carries

  15. codon 1 codon 2 codon 3 C A U U C A G A C anti-codon 1 anti-codon 2 anti- codon 3 mRNA G U A A G U C U G tRNA

  16. Step 3 - Linking Amino acids brought to ribosome by tRNA - linked together

  17. tRNA w/ complimentary anti-codon - fits into ribosome - drops off amino acid attached & links to protein chain

  18. codon 1 codon 2 codon 3 C A U U C A G A C anti-codon 1 anti-codon 2 anti- codon 3 mRNA G U A A G U C U G tRNA Amino acid Valine (Val) Serine (Ser) Leucine (Leu)

  19. STOP codon - on mRNA -stops linking amno acids • START codon - start linking amino acids