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Updated: Jun 24, 2026

Analyzing and Building Nucleic Acid Structures with 3DNA
Published on: April 26, 2013
ScanMoment: a web server for combinatorial analysis of basic residues in nucleic acid binding sites
1Department of Biology, University of Puerto Rico - Rio Piedras, PO Box 23360, San Juan, Puerto Rico 00931. stevenemassey@gmail.com
Unlabelled:
ScanMoment is a webserver designed to identify the presence of the basic faced alpha-helix (BFAH) motif in the nucleic acid binding sites of proteins. The program calculates the 'Basic Moment', a parameter that quantitizes the distribution of basic residues on the surface of an alpha-helix. A sliding window is used to generate a plot displaying regions of the protein sequence that possesses a high Basic Moment and hus likely to possess a BFAH motif. The user may vary the periodicity from that of an alpha-helix (100 degrees ), to those of other secondary structures such as beta sheets and 3(10) helices. The program can also plot the periodicity of basic residues in a protein sequence using a Fourier transformation. The procedure has been used to characterize the presence of BFAHs in the N-terminal extensions of the eukaryotic aminoacyl-tRNA synthetases and to indicate the presence of a BFAH in the tRNA binding site of alanyl-tRNA synthetase.
Availability:
www.scanmoment.org.
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