Bioinformatics Toolbox™

int2aa - Convert amino acid sequence from integer to letter representation

Syntax

SeqChar = int2aa(SeqInt) SeqChar = int2aa(SeqInt, 'Case', CaseValue)

Arguments

`SeqInt`	Row vector of integers specifying an amino acid sequence. For valid integers, see the table Mapping Amino Acid Integers to Letter Codes. Integers are arbitrarily assigned to IUB/IUPAC letters.
`CaseValue`	String specifying the case of the returned string. Choices are `'upper'` (default) or `'lower'`.

Return Values

SeqChar Amino acid sequence specified by a string of single-letter codes.

Description

SeqChar = int2aa(SeqInt) converts SeqInt, a row vector of integers specifying an amino acid sequence, to SeqChar, a string of single-letter codes specifying the same amino acid sequence. For valid integers, see the table Mapping Amino Acid Integers to Letter Codes.

SeqChar = int2aa(SeqInt, 'Case', CaseValue) specifies the case of the returned string. Choices are 'upper' (default) or 'lower'.

Mapping Amino Acid Integers to Letter Codes

Amino Acid	Integer	Code
Alanine	`1`	`A`
Arginine	`2`	`R`
Asparagine	`3`	`N`
Aspartic acid (Aspartate)	`4`	`D`
Cysteine	`5`	`C`
Glutamine	`6`	`Q`
Glutamic acid (Glutamate)	`7`	`E`
Glycine	`8`	`G`
Histidine	`9`	`H`
Isoleucine	`10`	`I`
Leucine	`11`	`L`
Lysine	`12`	`K`
Methionine	`13`	`M`
Phenylalanine	`14`	`F`
Proline	`15`	`P`
Serine	`16`	`S`
Threonine	`17`	`T`
Tryptophan	`18`	`W`
Tyrosine	`19`	`Y`
Valine	`20`	`V`
Asparagine or Aspartic acid (Aspartate)	`21`	`B`
Glutamine or Glutamic acid (Glutamate)	`22`	`Z`
Unknown amino acid (any amino acid)	`23`	`X`
Translation stop	`24`	`*`
Gap of indeterminate length	`25`	`-`
Unknown (any integer not in table)	`0` or ≥ `26`	`?`

Examples

Convert an amino acid sequence from integer to letter representation.