amino acids Flashcards by Heppy Robb

name the property glycine has and give its formula

hydrophobic

formula: C2H5N1O2

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name the property alanine has and give its formula

hydrophobic

formula: C3H7N1O2

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name the property proline has and give its formula

hydrophobic

formula: C5H9N1O2

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name the property valine has and give its formula

hydrophobic

formula: C5H11N1O2

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name the property leucine has and give its formula

hydrophobic

formula: C6H13N1O2

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name the property isoleucine has and give its formula

hydrophobic

formula: C6H13N1O2

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name the property tryptophan has and give its formula

hydrophobic

formula: C11H12N2O2

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name the property phenylalanine has and give its formula

hydrophobic

formula: C9H11N1O2

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name the property serine has and give its formula

polar

formula: C3H7N1O3

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name the property threonine has and give its formula

polar

formula: C4H9N1O3

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name the property tyrosine has and give its formula

polar

formula: C9H11N1O3

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name the property asparagine has and give its formula

polar

formula: C4H8N2O3

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name the property glutamine has and give its formula

polar

formula: C5H10N2O3

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name the property cysteine has and give its formula

polar

formula: C3H7N1O2S1

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name the property lysine has and give its formula

positively charged

formula: C6H14N2O2

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name the property arginine has and give its formula

positively charged

formula: C6H14N4O2

name the property histidine has and give its formula

positively charged

formula: C6H9N3O2

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

negatively charged

formula: C4H7N1O4

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

negatively charged

formula: C5H9N1O4

name the property methionine has and give its formula

hydrophobic

formula: C5H11N1O2S1

name all 9 hydrophobic amino acids

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

name all 6 polar amino acids

serine, threonine, tyrosine, asparagine, glutamine, cysteine

name all 3 positively charged amino acids

lysine, arginine, histidine

name the 2 negatively charged amino acids

aspartate/aspartic acid, glutamate/glutamic acid

why are hydrophobic amino acids hydrophobic?

the R group is nonpolar

why are polar amino acids polar?

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

why are positively charged amino acids positively charged?

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

why are negatively charged amino acids negatively charged?

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

describe the interactions found between an integral protein and the membrane

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

describe the interactions found between an peripheral protein and the membrane

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.

describe the interactions in an alpha helix transmembrane protein

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.

describe the interactions in a beta barrel transmembrane protein

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