One of the most common ways LabKey Biologics is used is in researching protein based molecules, often times antibodies. To support this research, LabKey Biologics is equipped with specialized triggers that automatically register commonly seen molecular species when a new antibody is created.
When engineering antibodies, the heavy chain and light chain sequences often have signal peptides (or leader sequences) as part of their overall sequence. When these proteins are expressed within a transformed cell line, these signal peptides are cleaved as the proteins are brought out of the cell.
Within LabKey Biologics, when you register a new “molecule” (that is composed of solely of protein sequences), the application automatically examines these sequences to determine if there are signal peptides present. If there are, LabKey Biologics will also register “molecular species” that have the same sequences (and stoichiometry) as the original molecule, without the leader sequences. This is called the “mature” molecular species. Similarly, if the molecule’s heavy chain contains a C-terminal lysine, LabKey Biologics will register a “mature, desK” molecular species that has cleaved the leader sequence(s) as well as the C-terminal lysine(s).
The “mature” and “mature, desK” molecular species are automatically generated and registered by LabKey Biologics. In the laboratory, however, you might detect other molecular species that stem from over-clipping and under-clipping of the leader sequences. LabKey Biologics allows you to manually register these as well, allowing you to connect all of these observed and predicted entities.
New Protein Sequences and Molecule Sets
For molecular species that are automatically generated, their components are often times new protein sequences. These sequences are also automatically generated, along with information about where the sequence came from. LabKey Biologics helps you keep track of those relationships.
Finally, researchers needed a mechanism to refer to all molecules for which the only difference is the leader sequence(s) of the protein sequence(s). For this, LabKey Biologics also automatically assign each molecule to a molecule set. For each molecule in a molecule set, the “mature” molecular species has the exact same components.