Amino acid structures, abbreviations and molecular weights

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Technical Reference

AMINO ACIDS: Structures, Abbreviations and Molecular Weights

AMINO ACID STRUCTURES

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ABBREVIATIONS and MOLECULAR WEIGHTS

THE GENETIC CODE

2nd Position
	U	C	A	G
U	UUU Phe	UCU Ser	UAU Tyr	UGU Cys	U
	UUC Phe	UCC Ser	UAC Tyr	UGC Cys	C
	UUA Leu	UCA Ser	UAA Stop	UGA Stop	A
	UUG Leu	UCG Ser	UAG Stop	UGG Trp	G

C	CUU Leu	CCU Pro	CAU His	CGU Arg	U
	CUC Leu	CCC Pro	CAC His	CGC Arg	C
	CUA Leu	CCA Pro	CAA Gln	CGA Arg	A
	CUG Leu	CCG Pro	CAG Gln	CGG Arg	G

A	AUU Ile	ACU Thr	AAU Asn	AGU Ser	U
	AUC Ile	ACC Thr	AAC Asn	AGC Ser	C
	AUA Ile	ACA Thr	AAA Lys	AGA Arg	A
	AUG Met	ACG Thr	AAG Lys	AGG Arg	G

G	GUU Val	GCU Ala	GAU Asp	GGU Gly	U
	GUC Val	GCC Ala	GAC Asp	GGC Gly	C
	GUA Val	GCA Ala	GAA Glu	GGA Gly	A
	GUG Val	GCG Ala	GAG Glu	GGG Gly	G

The codons are read in the 5′ to 3′ direction. Termination codons are in bold. AUG start codon is in bold italic. The left side of this chart lists the first position of the codon, the top row lists the second (2nd) position of the codon and the right side lists the third position of the codon.

PEPTIDE BOND FORMATION

R₁ and R₂ represent the R groups of the two amino acids.