Guyton Question anyone.........

[naveenanirada]

Hi folks,

Guyton, chapt.3, pg.31 has a table = 3.1

It says RNA;CODONS FOR AMINOACIDS AND FOR START AND STOP

The text says = table 3.1 gives the RNA codons for the 20 common amino acids found in protein molecules.Note that most of the amino acids are represented by more than one codon, also one codon represents the signals ' start manufacturing a protein molecule ' .

==================================================
Please find the table 3.1 below
AMINO ACID RNA CODONS
Alanine GCU GCC GCA GCG
Arginine CGU CGC CGA CGG
Asparagine AAU AAC
Aspartic acid GAU GAC
Cystine UGU UGC
Glutamic acid GAA GAG
Glutamine CAA CAG
Glycine GGU GGC GGA GGG
Histidine CAU CAC
Isoleucine AUU AUC AUA
Leucine CUU CUC CUA CUG
Lysine AAA AAG
Methionine AUG
Phenylalanine UUU UUC
Proline CCU CCC CCA CCG
Serine UCU UCC UCA UCG
Threonine ACU ACC ACA ACG
Tryptophan UGG
Tyrosine UAU UAC
Valine GUU GUC GUA GUG

================================================
What do the codons represent?Do multiple codons reprsent the samr AAcid?
Would appreciate any help in understanding the above table and text.
Regards and cheers
NN

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[bhuvi]

There are total 64 codons, all written in 5' --3' direction. 61 codons encode for the aminoacids and 3 i.e, UAA, UGA, UAG are stop codons.
AUG is the start codon, methionine in eukaryotes, formyl meth in prokaryotes.

Codon is unambigious.. ie each codon for not >1 aa
Codon is degenerate.. >1 codon for all aa, except for meth(AUG) and tryptophan(UGG)
Codon is universal, same in all organisms


Hope this helps1

 

[naveenanirada]

There are total 64 codons, all written in 5' --3' direction. 61 codons encode for the aminoacids and 3 i.e, UAA, UGA, UAG are stop codons.
AUG is the start codon, methionine in eukaryotes, formyl meth in prokaryotes.

Codon is unambigious.. ie each codon for not >1 aa
Codon is degenerate.. >1 codon for all aa, except for meth(AUG) and tryptophan(UGG)
Codon is universal, same in all organisms


Hope this helps1

Thanks BHUVI,thanks a bunch.