translation- taking the message of dna and converting it into an amino acid sequence
DESCRIPTION
Translation- taking the message of DNA and converting it into an amino acid sequence. Genes (DNA) to RNA to Proteins (Traits). Overview. Protein synthesis can be summarized in 2 main steps : - PowerPoint PPT PresentationTRANSCRIPT
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Translation- taking the message of DNA and converting it into an amino acid sequence.
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Genes (DNA) to RNA to Proteins (Traits)
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OverviewProtein synthesis can be summarized in 2
main steps:Transcription: One of the 2 strands of DNA
is transcribed into a single stranded messenger RNA, which carries the DNA message to the ribosome.
Translation:The ribosome reads the messenger RNA and assembles the appropriate sequence of amino acids
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Post-transcription ProcessingProcess between transcription and
translationPre-mRNA molecule produced
and undergoes processing and editing. Introns – cut out and discardedExons – remaining pieces spliced back
together to form mRNA
• mRNA travels through nuclear membrane pore into cytoplasm
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Genes Contain IntronsIntrons and exons why? Evolution, spliced in different ways in
different tissues enabling one gene to produce several forms of mRNA, which can make several forms of a protein.
Takes a lot of energy to make initial large molecule.
Rule for gene expression, use to state until the 1990s:
1 gene = 1 proteinNot true any more 1 gene = can make many proteins
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TranslationOccurs at the Ribosome in the CytoplasmNecessary materials: Ribosomes (rRNA and
proteins), mRNA, tRNA, amino acidsProduces proteins (traits) by connecting
amino acids together with peptide bondsUses codons on mRNA to determine amino
acid sequence = genetic code
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Codons Codon= sequence of 3 nucleotides on mRNA
that codes for one amino acid or a start or stop signal during translation.
Each codon 3-lettered (bases) code codes for one amino acid
4 x 4 x 4= 64 possible triplet combinationsFirst codon discovered- UUU= phenylalanineCodon-Amino Acid chart or wheel.
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Genetic Code
Codon
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Codon-Amino Acid TableHow many start and stop codons are present?
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PracticemRNA AUGUCCACGGGAU
GA
AUGGGAAGACUAUAA
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All living organisms and viruses use this triplet genetic code - its that "biological unity" idea again!!!
How does translation relate to YOUR life? (Why do you need to know this, anyway?) All the proteins that make up YOU, your cells, your body, the foods you eat, all the living cells in the world, etc - are made this way! Every time your body needs more of a protein -
muscle protein, hair protein, enzymes, hormones, hemoglobin molecules, a gene carrying the information for that protein is
transcribed into mRNA, and the mRNA is made into protein!
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Structure of Ribosomes
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tRNA (anti-codons, amino acids) and mRNA (codons)
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TranslationRibosome has 3
sites.Ribosome can hold 1
mRNA strand and 2 tRNA molecules at a time.
400 amino acids in 20 seconds
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The steps of translation:
1. Initiation: mRNA enters the cytoplasm and becomes associated with ribosomes (rRNA + proteins).
2. Elongation: addition of amino acids one-by-one: As the ribosome moves along the mRNA, the tRNA transfers its amino acid to the growing protein chain, producing the protein - codon by codon!
3. Termination: when the ribosomes hits a stop codon - UAA, UGA, or UAG - the ribosome falls apart!
The same mRNA may be used hundreds of times during translation by many ribosomes before it is degraded (broken down) by the cell.
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Summary
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http://glencoe.mcgraw-hill.com/sites/0078802849/student_view0/unit3/chapter12/concepts_in_motion.html#
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Practice – DNA-mRNA-tRNA-amino acidDNA TACAATGCCGTAATTmRNA (codon)tRNA (anti-codon)Amino acids Protein
Be able to determine patterns in all directions
Practice-Keratin
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Types of MutationsPoint mutation
Substitution- wrong nucleotide base put in place
No protein madeProtein made without function (different AA in place)No effect (ie 2 different codons for same AA)
Insertion/Duplicaton (addition)- extra nucleotide placed in sequence- frameshift mutationDeletion (subtraction)- one fewer nucleotide is placed in sequence- frameshift mutation
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One mutation, can cause a completely new amino acid sequence to form: often called frameshift mutations
Shift triplet codes Example CCUAGCAUUGCA
CCUGCAUUGCA
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Mutations
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Other Chromosomal MutationsInversion- reverses the direction of parts of a chromosome
Translocation- part of a chromosome breaks off and attaches to anotheri.e. Down’s syndrome Extra piece of C. 21 is found.
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Gene RegulationGenes are turned on and off as needed by the
cell.ProkaryotesPromoter, operator, repressor protein, genesEx. Lac operon- if lactose present E. coli
makes proteins to break down lactose- lactose binds to repressor protein which detaches from the operator – the operator is switched on and RNA polymerase can move along gene making mRNA.
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Lac operon
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Operon continued
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Eukaryotes- regulationMore complicated with more regulatory
proteins.Regulatory proteins= transcription factorsEnhancer, activator, promoter, transcription
factor, RNA polymerase. No operatorActivators increase attraction of RNA
polymerase for the promoterTextbook page 215
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