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GeneticCode - course since there are 64 codons and only 20...

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ECE 496 AMINO ACIDS AND THE GENETIC CODE Spring 2007 Here are the 20 amino acids in alphabetical order (along with a three-letter abbreviation for each): ala — alanine leu — leucine arg — arginine lys — lysine asn —asparagine met — methionine asp — aspartic acid phe — phenylalanine cys — cysteine pro — proline gln — glutamine ser — serine glu — glutamic acid thr — threonine gly — glycine trp — tryptophan his — histidine tyr — tyrosine ile — isoleucine val — valine Below is a table illustrating the correspondence between RNA codons — i.e. ordered triplets of the RNA nucleotides adenine (A), Uracil (U), cytosine (C), and guanine (G) — and amino acids. Each codon “codes” for at most one amino acid. Note that the code is redundant (of
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Unformatted text preview: course) since there are 64 codons and only 20 amino acids. The leftmost column indicates the first nucleotide in the codon, the upper row the second, and the rightmost column the third. For example, the codon UAC “codes for” cysteine. Three codons — UAA, UGA, and UAG — code for no amino acid. These codons serve as “punctuation marks” in the genetic code. U C A G U phe ser tyr cys U U phe ser tyr cys C U leu ser punct. punct. A U leu ser punct. trp G C leu pro his arg U C leu pro his arg C C leu pro gln arg A C leu pro gln arg G A ile thr asn ser U A ile thr asn ser C A ile thr lys arg A A met thr lys arg G G val ala asp gly U G val ala asp gly C G val ala glu gly A G val ala glu gly G...
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