Protein Sequence Alignment for Two Protein Sequences

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Description

Protein Sequence Alignment for Two Protein Sequences

Usage

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twoSeqSim(seq1, seq2, type = "local", submat = "BLOSUM62")

Arguments

seq1

A character string, containing one protein sequence.

seq2

A character string, containing another protein sequence.

type

Type of alignment, default is 'local', could be 'global' or 'local', where 'global' represents Needleman-Wunsch global alignment; 'local' represents Smith-Waterman local alignment.

submat

Substitution matrix, default is 'BLOSUM62', could be one of 'BLOSUM45', 'BLOSUM50', 'BLOSUM62', 'BLOSUM80', 'BLOSUM100', 'PAM30', 'PAM40', 'PAM70', 'PAM120', 'PAM250'.

Details

This function implements the sequence alignment between two protein sequences.

Value

An Biostrings object containing the scores and other alignment information.

Author(s)

Nan Xiao <http://nanx.me>

See Also

See parSeqSim for paralleled pairwise protein similarity calculation based on sequence alignment. See twoGOSim for calculating the GO semantic similarity between two groups of GO terms or two Entrez gene IDs.

Examples

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# Be careful when testing this since it involves sequence alignment
# and might produce unpredictable results in some environments

require(Biostrings)

s1 = readFASTA(system.file('protseq/P00750.fasta', package = 'protr'))[[1]]
s2 = readFASTA(system.file('protseq/P10323.fasta', package = 'protr'))[[1]]
seqalign = twoSeqSim(s1, s2)
summary(seqalign)
print(seqalign@score)

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