Lecture Notes 9-17-08 - ProteinOrganization...

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Protein Organization Primary structure – amino acid sequence Secondary structure – local interactions between  amino acids, such as  α  helixes and  β  sheets Tertiary structure – the full three-dimensional  structure of a polypeptide chain Quaternary structure – complexes of more than  one polypeptide chain Protein domain is the term used to describe  structurally stable independent subunits within  one polypeptide chain, which are usually  connected to each other by relatively short and  unstructured polypeptide segments.
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G Proteins – membrane proteins with  multiple subunits G proteins are attached to the cytoplasmic side  of the cell membrane They serve as intermediate messengers by  being activated by an external stimulus and then  activating other proteins They are composed of three protein subunits –  α β γ In the unstimulated state the 
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Lecture Notes 9-17-08 - ProteinOrganization...

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