JYC: CSM17 BioinformaticsCSM17 Week 6: DNA, RNA and Proteins Transcription (reading the DNA template) Translation (RNA -> protein) Protein Structure.

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Presentation transcript:

JYC: CSM17 BioinformaticsCSM17 Week 6: DNA, RNA and Proteins Transcription (reading the DNA template) Translation (RNA -> protein) Protein Structure

JYC: CSM17 Transcription - reading the data enzyme - transcriptase gene opens up and... messenger RNA (for each gene) is formed introns (non-coding regions) are removed mRNA moves off through nuclear pores......to the ribosomes Note: –DNA sense strand (mRNA has T->U) –and antisense strand (complement of mRNA)

JYC: CSM17 Transcription - reading the data A T G C A T G C Sense Strand (Partner) | | | | T A C G T A C G Antisense (Template)

JYC: CSM17 Transcription - reading the data A T G C A T G C Sense Strand (Partner) | | | | T A C G T A C G Antisense (Template)

JYC: CSM17 Transcription - reading the data A T G C A T G C Sense Strand (Partner) | | | | A U G C A U G C Messenger RNA | | | | T A C G T A C G Antisense (Template)

JYC: CSM17 RNA (Ribose Nucleic Acid) single chain sugar-phosphate backbone nucleotide bases (nt) Adenine (A) Guanine (G) Cytosine (C) Uracil (U) [DNA has Thymine (T)] plant viruses, retroviruses (e.g. HIV)

JYC: CSM17 Translation - reading the mRNA transfer RNA (tRNA) for each amino acid –clover-leaf structure codons and anticodons (triplets of bases) long chains of amino acids are built up

JYC: CSM17

Amino Acids 20 in total building blocks of proteins

JYC: CSM17 Proteins & Polypeptides polypeptides are short proteins are long enzymes are proteins that act as catalysts haemoglobin (in blood) is a protein

JYC: CSM17 Protein Structure strings of amino acids primary (first) structure - AA sequence secondary (second) structure - e.g. Spiral tertiary (third) structure - complex shape –has a large influence on function

JYC: CSM17 Mutation

JYC: CSM17 Mutation changes of nucleotide bases caused by –ionizing radiation, mutagenic chemicals usually harmful (damaging) may be –single base (changing one amino acid) –frameshift (more serious)

JYC: CSM17 Sequence Comparison Simple Alignment match score: 1mismatch score 0 A A T C T A T A A A G A T A4 + 0 = 4(best) A A T C T A T A A A G A T A1 + 0 = 1 (worst) A A T C T A T A A A G A T A3 + 0 = 3

JYC: CSM17 Sequence Comparison Simple Alignment with gap penalties match score: 1mismatch score 0gap penalty -1 A A T C T A T A A A G - A T - A = 1(worst) A A T C T A T A A A - G - A T A5 + 0 – 2 = 3(equal best) A A T C T A T A A A - - G A T A5 + 0 – 2 = 3 (equal best) A A T C T A T A - A A G A T A – 2 = -1 (worst)

JYC: CSM17 Sequence Comparison Simple Alignment with origination and length penalties match score: 1mismatch score 0 origination penalty: -2length penalty -1 A A T C T A T A A A - G - A T A5 + 0 – 4 – 2 = -1(worst) A A T C T A T A A A - - G A T A5 + 0 – 2 – 2 = 1 (best) Origination penalty is applied for starting a series of gaps Length penalty is also applied for each gap

JYC: CSM17 Databases NCBI Genbank EBI European Bioinformatics Institute EMBL European Molecular Biology Lab. you can conduct BLAST – Basic Local Alignment Search Tool – searches

JYC: CSM17 Useful Websites GeneStudio Sequence Converter – Mitochondrial maps – European Molecular Biology Laboratory – BioEdit –

JYC: CSM17 References & Bibliography Watson, J. (2003). DNA- the Secret of Life. Heinemann. ISBN Gibas, C. & Jambeck, P. (2001). Developing bioinformatics computer skills. O’Reilly, USA. pp. 4-8, 22-29, , , ISBN (paperback) Hofstadter, D. (1979) Gödel, Escher, Bach: An Eternal Golden Braid, Penguin Books, London, UK. pp Rose, S. (1979, reprinted 1987) The Chemistry of Life. Penguin Books (Pelican), London. (paperback). Vander, A., Sherman, J. & Luciano, D. (1994). Human Physiology. Chapter 2 & Chapter 4. McGraw-Hill, New York. ISBN (paperback) Lewin, B. (1997). Genes. (6 th edition) Oxford University Press, UK. (Chapters 4 & 11)