Lecture 4 - Protein Structure

Lecture 4 - Protein Structure - Lecture 4 Background...

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1 Protein Structure Biology 1F25 for Biology Non-Majors Lecture 4 Background Reading Textbook, Chapters 2 and 21 The People Who Prepared This Lecture Harry Peery Jeff Stuart What is a protein? Name some kinds of proteins Enzymes Transporters Hormones (some) Hormone receptors Structural elements Motors The actual work a cell does is done by proteins
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2 Once one amino acid is joined to the other… • After the tRNA has brought a specific amino acid to the ribosome, enzymes in the 60s top part of the ribosome bond the amino acid to the preceding amino acid. • It is like putting pearls on a string - one after the other – only with amino acids which are chemically bonded together by peptide bonds. The R group determines the angle of the peptide bond • Many of the R groups on amino acids are charged. • Like charges repel (two positive or two negative charges). • Unlike charges attract (a + charge attracts a charge) • This changes the angle of the protein chain in the primary structure of protein. Like charges repel + + Peptide bond Move Apart Proteins can bend and fold as a result This is a protein with 46 amino acids (from cabbage). Note the folds. Model from the National University of Ireland, Centre for Molecular Modeling and Crystallography
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3 Protein Structure For more information, see page 447 in your textbook and the following slides. Protein Structure – 1: The Primary Structure of Protein + + Peptide bond Move Apart Amino acids are joined together on the ribosome by a peptide bond to form a protein. This is the primary structure of protein – the joining of amino acids by a peptide bond. Protein Structure – The Secondary Structure of Protein:
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Lecture 4 - Protein Structure - Lecture 4 Background...

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