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Amino Acid Structure Chart

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20 Primary Amino Acids

Amino Acid3-Letter1-LetterAmino Acid3-Letter1-Letter
AlanineAlaALeucineLeuL
ArginineArgRLysineLysK
AsparagineAsnNMethionineMetM
Aspartic AcidAspDPhenylalaninePheF
CysteineCysCProlineProP
Glutamic AcidGluESerineSerS
GlutamineGlnQThreonineThrT
GlycineGlyGTryptophanTrpW
HistidineHisHTyrosineTyrY
IsoleucineIleIValineValV

Amino Acid Structure Chart

ClassificationAmino AcidFormulaMolecular WeightIsoelectric PointStructure
Aliphatic Amino Acids with Hydrophobic Side ChainAlanineC3H7N1O289.096.00

Alanine

IsoleucineC6H13N1O2131.175.94

Isoleucine

LeucineC6H13N1O2131.175.98

Leucine

ValineC5H11N1O2117.155.96

Valine

Aromatic Amino Acids with Hydrophobic Side ChainPhenylalanineC9H11N1O2165.195.48

Phenylalanine

TryptophanC11H12N2O2204.235.89

Tryptophan

TyrosineC9H11N1O3181.195.66

Tyrosine

Amino Acids with Neutral Side ChainAsparagineC4H8N2O3132.125.41

Asparagine

CysteineC3H7N1O2S1121.165.02

Cysteine

GlutamineC5H10N2O3146.155.65

Glutamine

MethionineC5H11N1O2S1149.215.74

Methionine

SerineC3H7N1O3105.095.68

Serine

ThreonineC4H9N1O3119.125.64

Threonine

Amino Acids with Positive Charged Side ChainArginineC6H14N4O2174.211.15

Arginine

HistidineC6H9N3O2155.167.47

Histidine

LysineC6H14N2O2146.199.59

Lysine

Amino Acids with Negative Charged Side ChainAspartic AcidC4H7N1O4133.12.77

Aspartic Acid

Glutamic AcidC5H9N1O4147.133.22

Glutamic Acid

Unique Amino AcidsGlycineC2H5N1O275.075.97

Glycine

ProlineC5H9N1O2115.136.30

Proline

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