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9 Cards in this Set
- Front
- Back
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What unit do we use to measure proteins? |
Daltons (Da) |
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What are some functions of proteins in living organisms? |
`Structural support, catalyses of metabolic reactions, DNA replication machinery, transport, signaling |
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What are the four levels of structure possible in proteins? What kind of bonds determine each of these structures? |
Primary structures: dependent on peptide bonds Secondary Structures: dependent on hydrogen bonds Tertiary structures: dependent on hydrogen, hydrophobic/hydrophilic interactions, ionic bonds, covalent bonds Quaternary structures: dependent on hydrogen, hydrophobic/hydrophilic interactions, ionic bonds, covalent bonds |
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Briefly describe why protein function is tied to its 3D structure |
The shape of the pocket and the interactions between the amino acid and substrate inside the pocket determine the nature of the interaction |
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What kind of interactions mainly stabilize protein structure |
Protein structure is generally stabilized by many weak interactions |
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What is primary structure? |
The primary structure is the sequence of amino acids. |
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What is a peptide group? What atoms are in a peptide group? |
Peptide groups are centered around a peptide bond and consist of six atoms in a plane. 1) alpha carbon of an amino acid 2) carbon and oxygen that were part of the carboxy group 3) nitrogen and hydrogen that were part of the amino group 4) alpha carbon of the next amino acid in the chain |
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What causes the atoms in a peptide group to exist in one plane? |
The peptide C-N bond acts like a double bond because of resonance |
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Between which atoms in a chain of amino acids do we see rotation? How are those bond angles indicated? |
Rotation is permitted around the N-C and C-C bonds. |
