ppt 1

• Defense: Some protein allow you to detect intruders.
• Transport: Cells need transport proteins to control what comes in and out
• Regulation: hormones (ex. insulin lowers blood sugar)
• Motion: protein complexes allow things to move.
• Storage: Protein can keep molecules from interacting with others or being damaged
• What are the 7 functions of proteins?

  Enzyme Catalysis, Defense, Transport, Support, Regulation, Motion and Storage
• R group determines behavior
• Nonpolar: Hydrophobic exclusion or Van der walls (CH2 or CH3)
• Polar: H-bonds (electronegative element often O-)
• Charged: Ionic bonds (Ionizable R+ R-)
• S.F: Disulfide bridge (cysteine)
• Chain amino and carboxyl by polymerization
• Bond between two amino acids is called peptide bond
• Primary structure: simple polypeptide, formed by peptide bonds (dehydration synthesis to form bonds)
• Secondary structure: Nonvariable part of backbone tends to form h-bonds. Forms 2 patterns alpha and beta.
• Tertiary structure: Secondary structure + interactions between R-groups forms 3D structure.
• Motifs: common regional pattern