Transcription of Chapter 6 - Proteins: Three Dimensional Structure Introduction
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Chapter 6 - Proteins: Three Dimensional Structure Introduction
Chapter 6 - Proteins: Three Dimensional StructureIntroduction:The first x-ray Structure for a protein was that for myoglobin in 1958 andindicated an apparent lack of regularity in the Structure . Although such a lack ofregularity is necessary considering the lack of regularity in function of proteins. Nevertheless there is a lot of regularity in protein Structure , which isconceptualized as consisting of several Structure is the (covalent) sequenceHigher order Structure is noncovalent (secondary, tertiary, quaternary)(Figure 6-1)NHCOCNHOS econdary StructurePauling and Corey determined the X-ray structures of several dipeptidesand found that the peptide bond is rigid and planar, which is due to its partialdouble bond character. Most peptides adopt a trans, planar configuration (more stable than cis by about 8kj/mole). Cis proline is an exception - about 10% in cis configuration (Figure 6-3).
Chapter 6 - Proteins: Three Dimensional Structure Introduction: The first x-ray structure for a protein was that for myoglobin in 1958 and indicated an apparent lack of regularity in the structure. Although such a lack of regularity is necessary considering the lack of regularity in function of proteins.
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