Amino Acid Structures Flashcards Preview

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Flashcards in Amino Acid Structures Deck (20)
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1

Arginine

Positively Charged

Arg, R

Capped with guanidinium group

2

Asparagine

Polar derivative fo Aspartate

Asn, N

Contains terminal carboxamide in place of carboxyic acid

3

Aspartate

Negatively charged

Asp, D

Same as aspartic acid

4

Cysteine

Polar, forms disulfide bonds

Cys, C

Similar to serine but has sulfhydryl (SH) group in place of hydroxyl -> much more reactive

5

Glutamate

Negatively charged 

Glu, E

Same as glutamic acid

6

Glutamine

Polar derivative of Glutamate

Gln, Q

Contains terminal carboxamide in place of carboxylic acid

Side chain is one methylene group longer than asparagine

7

Glycine

Hydrophobic small

Gly, G

achiral

8

Histidine

Postively charged imidazole group (aromatic ring)

Can be uncharged or charged near neutral pH -> often at enzyme active sites to bind/release H

His, H

9

Isoleucine

Hydrophobic larger

Ile, I

10

Leucine

Hydrophobic larger

Leu, L

11

Lysine

Postively charged

Lys, K

Capped with primary amino group

 

12

Methionine

Hydrophobic larger

Has sulfur (thioether group)

Met, M

13

Phenylalanine

(Purely) Hydrophobic, aromatic side chain

Phe, F

14

Proline

Hydrophobic

Closed Ring

Pro, P

15

Serine

Polar, Hydrophilic

Ser, S

Like Alanine with OH

16

Threonine

Polar, Hydrophilic

Thr, T

Like Valine with OH in place of methyl group

17

Tryptophan

Hydrophobic (less than phenylalanine because of NH groups), aromatic side chain

Trp, W

18

Valine

19

Tyrosine

Hydrophilic, aromatic

Tyr, Y

Like phenylalanine with OH replacing H on aromtic ring

20

Alanine

Hydrophobic small

Ala, A