Introduction to protein structure: Difference between revisions
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== Levels of Protein Structure == | == Levels of Protein Structure == | ||
<StructureSection load='1A3N' size='350' side='right' caption='Structure of Hemoglobin (PDB entry [[1A3N]])' scene=''> | <StructureSection load='1A3N' size='350' side='right' caption='Structure of Hemoglobin (PDB entry [[1A3N]])' scene=''> | ||
Proteins are condensation polymers of amino acids. The <scene name='57/575866/Primary_sequence/1'>primary structure</scene> is the amino acid sequence. The <scene name='57/575866/Secondary_sequence/1'>secondary structure</scene> is the local structure over short distances. This level of structure is stabilized by <scene name='57/575866/ | Proteins are condensation polymers of amino acids. The <scene name='57/575866/Primary_sequence/1'>primary structure</scene> is the amino acid sequence. The <scene name='57/575866/Secondary_sequence/1'>secondary structure</scene> is the local structure over short distances. This level of structure is stabilized by <scene name='57/575866/H_bond_a_helix/1'>hydrogen bonds</scene> along the <scene name='57/575866/Backbone/1'>backbone</scene>. These secondary structures pack together to form the overall form of the entire peptide chain, called the <scene name='57/575866/Tertiary/1'>tertiary structure</scene>. Some proteins, such as the displayed hemoglobin molecule, have more than one polypeptide chain that associate to form the functional unit of the protein; this is called <scene name='57/575866/Tertiary/2'>quaternary structure</scene>. | ||
'''Questions based upon these scenes:''' | |||
What is the primary sequence shown in the first link? | |||
Is the secondary structure shown an alpha helix or beta sheet? | |||
The ith C=O of the backbone is hydrogen bonded to which N(-H) (use i +/- # to represent the number)? | |||
What atom does this program NOT show? | |||
== Ways of representing protein structure == | == Ways of representing protein structure == | ||
