Protein Synthesis Making Proteins. Why Do We Need Proteins? 1.Cell Structure  Cell = 80% protein Cell membrane.

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Presentation transcript:

Protein Synthesis Making Proteins

Why Do We Need Proteins? 1.Cell Structure  Cell = 80% protein Cell membrane

Why Do We Need Proteins? 2.Cell Processes  Hormones (signals)  Enzymes (speed up reactions)

Why Do We Need Proteins?  Membrane Channels (remember transport?)  Neurotransmitters (carry nerve / brain messages)

What Do We Need For Protein Synthesis? 1.DNA Template for making mRNA during Transcription

What Do We Need For Protein Synthesis? 2. RNA a. mRNA = messenger RNA  makes & takes copy of DNA to cytoplasm b. tRNA = transfer RNA  Matches w/ mRNA on ribosome  Carries AA to add to protein chain ?s 1-7

What Do We Need For Protein Synthesis? c. rRNA = ribosomal RNA  Part of ribosome  Reads mRNA  Directs tRNA

What Do We Need For Protein Synthesis? 3. Ribosome  Reads mRNA  Directs tRNA  Creates peptide bonds between AAs (makes polypeptide chain)

What Do We Need For Protein Synthesis? 4. Amino Acids (AAs)  Building blocks of proteins (20 AAs exist)  Protein = AA chain = polypeptide chain  ORDER MATTERS! AA order determines f(x) of protein ?s 8-12

Steps of Protein Synthesis 1.Transcription (writing the “message”)  DNA ►mRNA messenger carries code to cytoplasm 2.Translation (reading the “message”)  mRNA ►tRNA ►protein (AA chain) message translated into a protein

Steps of Protein Synthesis

(Nucleus) (Cytoplasm) ↓

Transcription DNA ►mRNA 1.Location = nucleus 2.Steps a. Enzyme binds to DNA, unzips it b. mRNA copy of gene made from DNA template *U replaces T in RNA

Transcription 3 DNA nucleotides (triplet) ►mRNA codon Codons

Translation  mRNA ►tRNA ►protein (AA chain) Location = cytoplasm (first codon in mRNA is the start codon AUG) ?s 13-17

Translation Steps of Translation 1. mRNA moves to cytoplasm, binds to ribosome 2. tRNA anticodon UAC brings AA (methionine) to mRNA codon on ribosome

Translation 3. Ribosome moves down mRNA to next codon 4. tRNA anticodon brings & attaches next AA with peptide bond

Translation 5. tRNA leaves ribosome once AA attached tRNA mRNA AA Protein chain

Translation 6. Steps 1-5 repeated, adding AAs until STOP CODON * signals end of protein 7. Polypeptide chain released from ribosome * UAG, UAA, or UGA

Synthesis Practice DNA Triplet mRNA Codon tRNA Anti-codon TAC GGA CCT TAT ACT

Synthesis Practice DNA Triplet mRNA Codon tRNA Anti-codon TACAUG GGA CCT TAT ACT

Synthesis Practice DNA Triplet mRNA Codon tRNA Anti-codon TACAUGUAC GGA CCT TAT ACT

Synthesis Practice DNA Triplet mRNA Codon tRNA Anti-codon TACAUGUAC GGACCU CCT TAT ACT

Synthesis Practice DNA Triplet mRNA Codon tRNA Anti-codon TACAUGUAC GGACCUGGA CCT TAT ACT

Synthesis Practice DNA Triplet mRNA Codon tRNA Anti-codon TACAUGUAC GGACCUGGA CCTGGA TAT ACT

Synthesis Practice DNA Triplet mRNA Codon tRNA Anti-codon TACAUGUAC GGACCUGGA CCTGGACCU TAT ACT

Synthesis Practice DNA Triplet mRNA Codon tRNA Anti-codon TACAUGUAC GGACCUGGA CCTGGACCU TATAUA ACT

Synthesis Practice DNA Triplet mRNA Codon tRNA Anti-codon TACAUGUAC GGACCUGGA CCTGGACCU TATAUAUAU ACT

Synthesis Practice DNA Triplet mRNA Codon tRNA Anti-codon TACAUGUAC GGACCUGGA CCTGGACCU TATAUAUAU ACTUGA

Synthesis Practice DNA Triplet mRNA Codon tRNA Anti-codon TACAUGUAC GGACCUGGA CCTGGACCU TATAUAUAU ACTUGAACU

AMINO ACID FUN!! DNA Triplet: ACC mRNA codon: UGG tRNA anti-codon: ACC Amino acid: Tryptophan Why you should know this? Tryptophan is in TURKEY – makes you sleepy

Protein Synthesis Animation ?s 18-25