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MBB161 > amino acids > Flashcards

amino acids Flashcards

1
Q

name the property glycine has and give its formula

A

hydrophobic

formula: C2H5N1O2

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2
Q

name the property alanine has and give its formula

A

hydrophobic

formula: C3H7N1O2

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3
Q

name the property proline has and give its formula

A

hydrophobic

formula: C5H9N1O2

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4
Q

name the property valine has and give its formula

A

hydrophobic

formula: C5H11N1O2

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5
Q

name the property leucine has and give its formula

A

hydrophobic

formula: C6H13N1O2

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6
Q

name the property isoleucine has and give its formula

A

hydrophobic

formula: C6H13N1O2

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7
Q

name the property tryptophan has and give its formula

A

hydrophobic

formula: C11H12N2O2

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8
Q

name the property phenylalanine has and give its formula

A

hydrophobic

formula: C9H11N1O2

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9
Q

name the property serine has and give its formula

A

polar

formula: C3H7N1O3

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10
Q

name the property threonine has and give its formula

A

polar

formula: C4H9N1O3

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11
Q

name the property tyrosine has and give its formula

A

polar

formula: C9H11N1O3

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12
Q

name the property asparagine has and give its formula

A

polar

formula: C4H8N2O3

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13
Q

name the property glutamine has and give its formula

A

polar

formula: C5H10N2O3

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14
Q

name the property cysteine has and give its formula

A

polar

formula: C3H7N1O2S1

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15
Q

name the property lysine has and give its formula

A

positively charged

formula: C6H14N2O2

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16
Q

name the property arginine has and give its formula

A

positively charged

formula: C6H14N4O2

17
Q

name the property histidine has and give its formula

A

positively charged

formula: C6H9N3O2

18
Q

name the property aspartate/aspartic acid has and give its formula

A

negatively charged

formula: C4H7N1O4

19
Q

name the property glutamate/glutamic acid has and give its formula

A

negatively charged

formula: C5H9N1O4

20
Q

name the property methionine has and give its formula

A

hydrophobic

formula: C5H11N1O2S1

21
Q

name all 9 hydrophobic amino acids

A

glycine, alanine, proline, valine, leucine, isoleucine, methionine, tryptophan, phenylalanine

22
Q

name all 6 polar amino acids

A

serine, threonine, tyrosine, asparagine, glutamine, cysteine

23
Q

name all 3 positively charged amino acids

A

lysine, arginine, histidine

24
Q

name the 2 negatively charged amino acids

A

aspartate/aspartic acid, glutamate/glutamic acid

25
Q

why are hydrophobic amino acids hydrophobic?

A

the R group is nonpolar

26
Q

why are polar amino acids polar?

A

the R groups are neutral but the charge is not evenly distributed

27
Q

why are positively charged amino acids positively charged?

A

the R groups have a positive charge at physiological pH (pH7)

28
Q

why are negatively charged amino acids negatively charged?

A

the R groups have a negative charge at physiological pH (pH7)

29
Q

describe the interactions found between an integral protein and the membrane

A

STRONG interactions with the membrane eg hydrophobic interactions with the f/a’s in the membrane. these anchor the protein to the membrane by non-polar interactions

30
Q

describe the interactions found between an peripheral protein and the membrane

A

TEMPORARY interactions with the polar head regions of the membrane or the integral proteins. these include hydrophilic interactions (H-bonds), electrostatic interactions and non-covalent interactions. peripheral proteins don’t interact with the hydrophobic core of the bilayer.

31
Q

describe the interactions in an alpha helix transmembrane protein

A

can be amphiphilic (allows protein to interact with water in a channel for example and the membrane) or hydrophobic. H-bonds stabilize alpha helix as do Van der Waals.

32
Q

describe the interactions in a beta barrel transmembrane protein

A

the outside is non-polar and interacts with the hydrophobic core of the membrane
the inside is polar and interacts with water found in the channel
eg porins

MBB161 (10 decks)

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