Athanor by arbastro
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How to build a peptide, DNA or RNA from its sequence

Choose Insert › Build from sequence…, type the one-letter sequence, pick Peptide, DNA or RNA and Residues or Full structure, and press Insert.

Steps

  1. Choose Main menu › Insert › Build from sequence….

  2. Type the sequence in one-letter codes, for example GLSDGEWQQVLNVWGK. The window reads it back with the residue count, the three-letter sequence, the formula and the molar mass.

    Build from sequence with 16 residues read back as H-Gly-Leu-Ser-...-Lys-OH, C82H122N22O25, 1816.01 g/mol.Build from sequence with 16 residues read back as H-Gly-Leu-Ser-...-Lys-OH, C82H122N22O25, 1816.01 g/mol.

  3. Pick the Type: Peptide, DNA or RNA.

  4. Pick Draw as: Residues for three-letter blocks, or Full structure for every atom. With residues, Per row sets how many go on a line.

  5. Ring and disulfides opens the options for a cyclic chain and disulfide bridges.

  6. Press Insert.

    The 16-residue peptide drawn as residues, from H-Gly to Lys-OH.The 16-residue peptide drawn as residues, from H-Gly to Lys-OH.

BiochemistryHow to browse and add monomersChoose Object › Chemistry › Monomers. Switch between Peptide, Nucleotide and Chemical, search by id or name, and add your own with an id and a SMILES with attachment points.BiochemistryHow to draw a plasmid mapChoose Insert › Plasmid map…, paste a sequence, FASTA or GenBank (or Paste an example), pick Circular or Linear, check the Map, Sites and Primers tabs, and press Insert the map.

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Last updated Nov 12, 2026