PROTEIN SYNTHESIS. copyright cmassengale
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1 PROTEIN SYNTHESIS 1
2 DNA and Genes 2
3 Roles of RNA and DNA DNA is the MASTER PLAN RNA is the BLUEPRINT of the Master Plan 3
4 RNA Differs from DNA RNA has a sugar ribose DNA has a sugar deoxyribose 4
5 Other Differences RNA contains the base uracil (U) DNA has thymine (T) RNA molecule is single-stranded DNA is doublestranded DNA 5
6 Structure of RNA 6
7 Central Dogma of Biology DNA codes for RNA which guides the synthesis of proteins! 7
8 . Three Types of RNA Messenger RNA (mrna) copies DNA s code & carries the genetic information to the ribosomes Ribosomal RNA (rrna), along with protein, makes up the ribosomes Transfer RNA (trna) transfers amino acids to the ribosomes where proteins are synthesized 8
9 amino acid attachment site mrna UA C anticodon trna rrna 9
10 Central Dogma of Biology Step 1 DNA codes for RNA which guides the synthesis of proteins! 10
11 TRANSCRIPTION IS HAPPENING AT THE SAME TIME AS DNA REPLICATION! 11
12 Transcription - 1 A portion of the DNA molecule unzips Recall: DNA helicase is the enzyme responsible for this! 12
13 Transcription - 2 RNA polymerase joins RNA nucleotides using the DNA strand as a template This new strand of RNA is the mrna strand 13
14 14
15 Transcription - 3 After the DNA is transcribed into RNA, editing must be done to the nucleotide chain to make the RNA functional 15
16 Transcription - 3 Introns, non-functional segments of DNA are snipped out of the chain Exons, segments of DNA that code for proteins, are then rejoined by the enzyme ligase 16
17 Result of Transcription CAP New Transcript Tail 17
18 mrna Transcript - 4 mrna leaves the nucleus through its pores and goes to the ribosomes 18
19 The Genetic Code A codon designates an amino acid An amino acid may have more than one codon There are 20 amino acids, but 64 possible codons Some codons tell the ribosome to stop translating 19
20 The Genetic Code Use the code by reading from the center to the outside Example: AUG codes for Methionine 20
21 Name the Amino Acids GGG? UCA? CAU? GCA? AAA? 21
22 Remember the Complementary Bases On DNA: A-T C-G On RNA: A-U C-G 22
23 Question: What would be the complementary RNA strand for the following DNA sequence? DNA 5 -GCGTATG-3 23
24 Answer: DNA 5 -GCGTATG-3 RNA 3 -CGCAUAC-5 24
25 Central Dogma of Biology Step 2 mrna creates proteins 25
26 Translation Translation is the process of decoding the mrna into a polypeptide chain to create proteins (amino acids) Ribosomes read mrna three bases or 1 codon at a time and construct the proteins 26
27 Transcription Translation 27
28 Ribosomes Composed of rrna and proteins Have two sites for trna attachment --- P and A The P site is the first to read the mrna 28
29 Step 1 mrna transcript start codon AUG must be read This signals to the ribosome to start making proteins mrna transcript 29
30 Ribosomes P Site A Site mrna A U G C U A C U U C G 30
31 Step 2 As ribosome moves, two trna with their amino acids move into site A and P of the ribosome 31
32 aa1 aa2 anticodon 1-tRNA 2-tRNA U A C G A U A U G C U A C U U C G A codon mrna 32
33 aa1 peptide bond aa2 aa3 3-tRNA anticodon hydroen bonds 1-tRNA 2-tRNA U A C G A U A U G C U A C U U C G codon G A mrna 33 A A
34 aa1 aa2 peptide bond aa3 1-tRNA U A C (leaves) 2-tRNA 3-tRNA G A A G A U A U G C U A C U U C G A Ribosomes move over one codon mrna 34
35 aa1 peptide bonds aa4 aa2 aa3 2-tRNA 3-tRNA G A U G A A A U G C U A C U U C G A 4-tRNA G C U A C U mrna 35
36 aa1 peptide bonds aa2 aa3 aa4 G 2-tRNA A U (leaves) 3-tRNA G A A A U G C U A C U U C G Ribosomes move over one codon A 4-tRNA G C mrna 36 U A C U
37 aa1 aa2 peptide bonds aa3 aa4 aa5 5-tRNA U G A 3-tRNA 4-tRNA G A A G C U G C U A C U U C G A A C U mrna 37
38 aa1 aa2 peptide bonds aa3 aa4 aa5 5-tRNA 3-tRNA G A A 4-tRNA G C G C U A C U U C G U A A C U Ribosomes move over one codon U G A mrna 38
39 aa4 aa5 aa199 Termination aa3 aa2 primary structure of a protein aa200 aa1 A C U C A U G U U mrna 200-tRNA terminator or stop codon U A G 39
40 End Product The Protein! The end products of protein synthesis is an amino acid chain that makes up a protein aa2 aa3 aa4 aa5 aa199 aa1 aa200 40
41 Messenger RNA (mrna) mrna start codon A U G G G C U C C A U C G G C G C A U A A codon 1 codon 2 codon 3 codon 4 codon 5 codon 6 codon 7 protein methionine glycine serine isoleucine glycine alanine stop codon Amino Acid Chain aa1 aa2 aa3 aa4 aa5 aa6 peptide bonds 41
42 Beadle & Tatum Hypothesis One GENE codes for one POLYPEPTIDE (protein) 42
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