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Protein Feature Accent Explanation

Viewing the structure

The tool will display a window that is organized into 4 sections:

How to type lists of residues

A set of residues can be typed in the 'Highlight residue numbers' box using the following rules:
You can indicate an interval of residue numbers, i.e., residue numbers 112 through 123, using a dash: '112-123'.
Separate residues can be indicated with a comma-separated list: '240, 256, 258'. Spaces after commas are fine.
These two formats can be combined: '112-123, 240, 256, 258'.

Glycosylation

The Protein Feature Accent tool identifies potential N-linked glycosylation sites (also called sequons or PNGs) that match the Nx[TS] motif, where 'x' can be any amino acid except proline. The asparagine (N) α-carbon is marked in the graphic. For a more complete analysis of glycosylation sites in your protein sequence set, try the N-GlycoSite tool.

See also Gavel & von Heijne, 1990, Zhang et al., 2004

Carbohydrate glycosylation structures

For certain structure files, such as the SIV gp-120 protein structure 2BF1, full glycosylation structure information is present. In these cases, an option to display these carbohydrates is offered. Note that for two of the display styles, 'cartoon' (the default view) and 'rocket', these carbohydrate structures do not appear. They reappear when the view is switched to one of the other display styles.

Entropy

When you submit an alignment to the tool, the Shannon entropy is calculated for each alignment column. This information can be visualized on the Jmol graphic by selecting the 'entropy' option under the menu labeled 'pick color scheme'. Zero- and low-entropy residues are colored a 'cool' color (e.g., blue-green), and higher entropy residues are shown in shades of yellow, orange, and red. Residues for which an entropy cannot be calculated (for instance, residues which correspond to an all-gap column in the alignment sequences you provide) are colored a distinctive 'cold' color (e.g., dark blue).

PDB model file upload

You can upload a Protein Data Bank model file and the tool will display your model instead of one of our stored protein models. The tool will extract and display the protein sequence from the PDB file you provide, and you can highlight residues in the graphic by selecting them as usual. If you provide a sequence or an aligned set of sequences, the tool will align the PDB file sequence to your sequence(s) and display the alignment.

last modified: Thu Aug 11 12:18 2011


Questions or comments? Contact us at seq-info@lanl.gov.

 
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