BIOCHEM 4 - AMINO ACIDS Flashcards Preview

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Flashcards in BIOCHEM 4 - AMINO ACIDS Deck (70)
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1

Essential Amino acids

L, I, V, H, K, M, F, T, W

2

Non-essential amino acids

A, R, N, D, C, E, Q, G, P, S, Y

3

aa (obtained from nutrition)

Essential Amino acids

4

aa (synthesized by the body)

Non-essential amino acids

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properties of AA (4)

Amphoteric
dipolar
optically active
tetrahedral structure

6

– reference to determine if the
amino acid has L- or D-configuration

α-amino group

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All amino acids in naturally occurring proteins are

L-isomers

8


◦ derived from glutamate; neurotransmitters (has something to do with the brain)

GABA

9

GABA is derived from

glutamate

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◦ derived from tryptophan; important in sleep

Serotonine

11

serotonine derived from

derived from tryptophan

12

3. Thyroxine

derived from tyrosine

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indole acetic acid


4. Dopamine –

14

– side chain is a primary alcohol; looks like Ala with -OH



Serine

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side chain is a secondary alcohol;

◦ Threonine

16

has two chirality centers

threonine and isoleucine

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contains a thiol group; important in disulfide linkages; weak acid; can form H-bonds

◦ Cysteine

18

- ionized cysteine is -----, while the protonated form is much --------than serine.

polar
less polar

19

also has the ability to form covalent bonds called disulfide bonds between cysteine side chains.

Cysteine

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– side chain is phenolic –OH; borderline case

Tyrosine

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not very soluble in water, but contains a polar hydroxyl group in the para position of the phenyl ring

Tyrosine

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amide groups do not become charged at biologically relevant pH values (i.e. pH 2-12), true or false

TRUE

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simplest amino acid

GLYCINE

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does not really have a polar or non-polar character

GLYCINE

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- has much less steric hindrance than the other AAs;

GLYCINE

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No chiral center/achiral

GLYCINE

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no asymmetric carbon

GLYCINE

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– side chain is isopropyl

Valine

29

side chain is isobutyl

Leucine

30

side chain is sec-butyl; has 2 chiral carbons

Isoleucine –

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