Ch_03_Lecture_3[1]

Ch_03_Lecture_3[1] - 0 Chapter 3 The Molecules of...

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1 Chapter 3 The Molecules of Cells 0 (Continued)
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2 0 Groove Groove Figure 3.13B Figure 3.13A 3.13 A protein’s specific shape determines its function A protein consists of one or more polypeptide chains Folded into a unique shape that determines the protein’s function Grooves: binding sites for other molecules Changes in heat, pH, or salinity proteins unfold and lose functionality: called denaturation
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3 3.14 A protein’s shape depends on four levels of structure 0
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4 Primary Structure A protein’s primary structure Is the sequence of amino acids forming its polypeptide chains 0 Levels of Protein Structure Primary structure Gly Thr Gly Glu Ser Lys Cys Pro Leu Met Val Lys Val Leu Asp Ala Val Arg Gly Ser Pro Ala Ile Asn Val Ala Val His Val Amino acids Phe Arg Figure 3.14A e.g., transthyretin in blood: important in the transport of a thyroid hormone and vitamin A; four polypeptide chains, each with 127 amino acids
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5 Single change in amino acid sequence in hemoglobin molecule changes the shape of red blood cells Normal red blood cell normal glutamic acid (polar charged) replaced by abnormal valine (nonpolar) decreased O 2 -carrying capacity
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6 Secondary structure A protein’s secondary structure Is the coiling or folding of the chain , stabilized by
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This note was uploaded on 04/07/2008 for the course BIO 100 taught by Professor Zhongma during the Spring '08 term at Truman State.

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Ch_03_Lecture_3[1] - 0 Chapter 3 The Molecules of...

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