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Ser: hydroxyl group

Asp: Carboxyl group

His: imidazole ring

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Serine - hydroxyl group (CH2-OH)

Histidine - imidazole ring

Aspartic Acid - carboxylate group (CH2-COO-)

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Serine

–CH₂–OH (hydroxyl group)

Histidine

–CH₂ (imidazole ring)

Aspartic acid

–CH₂–COOH (carboxylate group)

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1. Serine

Hydroxyl: -CH₂-OH

2. Aspartate

Carboxylate: -CH₂-COO⁻

3. Histidine

Imidazole Ring: -CH₂

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1. Serine (Ser)

R group: –CH₂–OH

2. Aspartate (Asp)

R group: –CH₂–COO⁻

3. Histidine (His)

R group: –CH₂–imidazole ring

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The R groups:

1. Serine (Ser)

–CH₂OH (Polar, uncharged, have hydroxyl group)

2. Aspartic Acis (Asp)

–CH₂COO⁻ (Negatively charged, acidic, have carboxylate group)

3. Histidine (His)

–CH₂–imidazole ring

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R groups of Ser, Asp and His :

SERINE ( Ser )

–CH₂–OH ( Hydroxyl group )

Aspartic Acid ( Asp )

–CH₂–COO⁻ ( Carboxylate group )

Histidine ( His )

–CH₂– imidazole ring

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R groups of Ser, Asp and His

Serine (Ser): –CH₂OH (hydroxyl group)

Aspartic acid (Asp): –CH₂COO⁻ (carboxylate group, negatively charged)

Histidine (His): –CH₂–imidazole ring (can be positively charged depending on pH)

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Ser ( Serine )

-CH2OH (hydroxyl methyl group,polar uncharged)

Asp ( Aspartic acid )

• R group: -CH2COOH or CH2COO- ( neutral pH)

• negatively charged carboxylate group (acidic) side chain

His (Histidine)

• R group : -CH2

•imidazole ring ( an aromatic ring with nitrogen)

# data[].attributes.body
Ser (Serine): –CH₂–OH

Asp (Aspartate): –CH₂–COO⁻

His (Histidine): –CH₂–imidazole ring

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R groups of Ser, Asp, His

Ser (Serine)

- R group: –CH₂OH

- Polar, uncharged, hydroxyl-containing

Asp (Aspartic acid)

- R group: –CH₂COOH (or –CH₂COO⁻ at neutral pH)

- Negatively charged (acidic) side chain

His (Histidine)

- R group: –CH₂–imidazole ring

- Weakly basic, can be positively charged depending on pH

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Ser

-CH2-OH ( a hydroxymethyl group )

Asp

-CH2-COO^- ( a negatively charged carboxylate group )

His

-CH2-imidazole ring ( an aromatic ring with a nitrogen )