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

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

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

Why Do We Need Proteins? Membrane Channels (remember transport?)Membrane Channels (remember transport?) Neurotransmitters (carry nerve/brain messages)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 and takes copy of DNA to cytoplasm b.tRNA = (transfer RNA) Matches w/ mRNA on ribosome and carries AA to add to protein chain

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 proteinsBuilding blocks of proteins (20 AAs exist) Protein = AA chainProtein = AA chain = polypeptide chain ORDER MATTERS!ORDER MATTERS! AA order determines function of protein

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 to 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) to mRNA codon Codons

Translation mRNA to tRNA to protein (AA chain) Location = cytoplasm (first codon in mRNA is the start codon)

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

Synthesis Practice ACUUGAACT AGAUCUAGA UAUAUATAT CCUGGACCT GGACCUGGA UACAUGTAC tRNA (anti-codon) mRNA (codon) DNA (triplet)

Synthesis Practice ACT AGA TAT CCT GGA TAC DNA(triplet) ACUUGA AGAUCU UAUAUA CCUGGA GGACCU UACAUG tRNA (anti- codon) mRNA(codon) Stop SerSerine IleIsoleucine GlyGlycine ProProline Met (Start) Methionine AminoAcid

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