extractProtQSO {Rcpi} | R Documentation

## Quasi-Sequence-Order (QSO) Descriptor

### Description

Quasi-Sequence-Order (QSO) Descriptor

### Usage

    extractProtQSO(x, nlag = 30, w = 0.1)

### Arguments

`x` | A character vector, as the input protein sequence.
`nlag` | The maximum lag, defualt is 30.
`w` | The weighting factor, default is 0.1.

### Details

This function calculates the Quasi-Sequence-Order (QSO) descriptor (Dim: `20 + 20 + (2 * nlag)`, default is 100).

### Value

A length `20 + 20 + (2 * nlag)` named vector

### Author(s)

Nan Xiao <https://nanx.me>

### References

Kuo-Chen Chou. Prediction of Protein Subcellar Locations by Incorporating Quasi-Sequence-Order Effect. Biochemical and Biophysical Research Communications, 2000, 278, 477-483.

Kuo-Chen Chou and Yu-Dong Cai. Prediction of Protein Sucellular Locations by GO-FunD-PseAA Predictor. Biochemical and Biophysical Research Communications, 2004, 320, 1236-1239.

Gisbert Schneider and Paul Wrede. The Rational Design of Amino Acid Sequences by Artifical Neural Networks and Simulated Molecular Evolution: Do Novo Design of an Idealized Leader Cleavge Site. Biophys Journal, 1994, 66, 335-344.

### See Also

See `extractProtSOCN` for sequence-order-coupling numbers.

### Examples

    x = readFASTA(system.file('protseq/P00750.fasta', package = 'Rcpi'))[[1]]
    extractProtQSO(x)

[Package Rcpi version 1.20.1 Index]