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cbe 235 > Protein Structure and Chemistry > Flashcards

Protein Structure and Chemistry Flashcards

1
Q

Aspartic Acid (Asp)

A

Polar Charged

Hydrophilic

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2
Q

Glutamic Acid (Glu)

A

Polar Charged

Hydrophilic

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3
Q

Lysine (Lys)

A

Polar Charged

Hydrophilic

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4
Q

Arginine (Arg)

A

Polar Charged

Hydrophilic

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5
Q

Amino Acid Stereoisomers

A

Amino acids that are made up of the same atoms and bonded by the same sequence of bonds, but have different 3-D structures

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6
Q

Histidine (His)

A

Polar Charged

Hydrophilic

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7
Q

Serine (Ser)

A

Polar Uncharged

Hydrophilic

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8
Q

Threonine (Thr)

A

Polar Uncharged

Hydrophilic

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9
Q

Glutamine (Gln)

A

Polar Uncharged

Hydrophilic

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10
Q

Asparagine (Asn)

A

Polar Uncharged

Hydrophilic

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11
Q

Tyrosine (Tyr)

A

Polar Uncharged

Hydrophilic

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12
Q

Alanine (Ala)

A

Nonpolar

Hydrophobic

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13
Q

Valine (Val)

A

Nonpolar

Hydrophobic

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14
Q

Leucine (Leu)

A

Nonpolar

Hydrophobic

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15
Q

alpha-helix

A

a secondary structure in which the amino acid chain is arranged in a right-handed spiral

Every backbone N−H group hydrogen bonds to the backbone C=O group located four residues earlier along the protein sequence

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16
Q

Isoleucine (Ile)

A

Nonpolar

Hydrophobic

17
Q

Methionine (Met)

A

Nonpolar

Hydrophobic

18
Q

Phenylalanine (Phe)

A

Nonpolar

Hydrophobic

19
Q

Tryptophan (Trp)

A

Nonpolar

Hydrophobic

20
Q

Glycine (Gly)

A

Side chain has only hydrogen atoms, can be hydrophilic or hydrophobic (non-chiral molecule)

21
Q

Cysteine (Cys)

A

Side chain in Polar Uncharged, but can form a covalent bond with another cysteine to form a disulfide link

22
Q

Proline (Pro)

A

Hydrophobic, but creates kinks in polypeptide chains that disrupt secondary structure

23
Q

Beta-pleated sheet

A

Occurs in globular proteins when two or more segments of a polypeptide chain line up next to each other, forming a sheet-like structure held together by hydrogen bonds

Every peptide bond is hydrogen bonded to a neighboring peptide bond

24
Q

What are the second structure levels of proteins

A

alpha-helix
beta-sheet

25
Q

What are the tertiary structures

A

domain
protein subunit (monomer)

26
Q

What is the quaternary structure

A

protein molecule (dimer)

27
Q

What are the levels of protein stucture in order

A

alpha-helix and beta-sheet —> domain —> protein subunit (monomer) —> protein molecule (dimer)

cbe 235 (27 decks)

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