In table form, draw, name and give the 3 letter abbreviation for any amino acid

Question

In table form, draw, name and give the 3 letter abbreviation for any amino acid of the common 20 which fulfills each of the given criteria. Note, each part is satisfied by a DIFFERENT amino acid (choose a DIFFERENT amino acid for (a) and for (b) and for (c) etc. Define the underlined terms or give an explanation, as required. is not chiral is not a primary amine is an isomer of another amino acid (name the other amino acid) is unusually abundant in natural proteins (why?) is unusually rare in natural proteins (why?) Draw the R group only, name and give the 3 letter abbreviation for one amino acid of the common 20 having an R group that fulfills the given criteria. (Same as above, a different R-group will satisfy each different pan of the question). For pans g, h, i, and j do not be fooled - choose the R-group, not the amino acid. absorbs light near 300 nm (why?) is chiral-NOT THE AMINO ACID! The R-group! There are only two possible right answers, not 19! can covalently bind to other another amino acid has a proton that changes ionization state at low pH has a proton that changes ionization state at high pH any amino acid that contains an element other than C, H, O, N Now. consider UN common amino acids. Draw and name: a hydroxylated version of a common amino acid, that might be found in collagen any amino acid that contains an element other than C, H, O, N or S Draw beta-alanine

Explanation / Answer

Amino acid

(a) not chiral : glycine as it does not have any carbon with four different groups on it. (Gly)

(b) Is not a primary amine : proline is a secondary amine (Pro)

(c) is an isomer of other amino acid : alanine homologue isomer of glycine (Ala)

(d) is usually abundant in natural protein : Phenyl alanine as ig forms hydrophobic bonds in the secondary structure )Phe)

(e) is usually rare in natural proteins : Tryptophan is rare as they are not easily made in nature (Trp)

(f) absorbs light near 300 nm : Tryptophan (Trp) R group = CH2-indole (Trp)

(g) is chiral : Isoleucine R group = CH(CH3)(CH2CH3) (Ile)

(h) covalently bind to another amino acid : lysine R group (CH2)4NH2 (Lys)

(i) has proton that changes ionization state at low pH : Asparatic acid R group CH2COOH (Asp)

(j) has proton that changes ionization state at low pH : lysine R group (CH2)4NH2 (Lys)

(k) with element other than C, H, N and O : cysteine R group (CH2)2SCH3 (Cys)

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