User Guide

On the home page, select all details of query to search for selectivity or binding modes. Example queries can be displayed for the list of kinase inhibitors from PKIDB. Bioactivities and 3D structures and biniding mode buttons redirects to Interactive selectivity exploration or Interactive binding mode exploration respectively. Each input text field is case insensitive and suggestion of awaited format are provided.

Bioactivity data search

selectivity_query.png

This section is composed of three input fields "Ligand", "Target" and "Bioactivity". Ligand selection is the only field required to search for bioactivity data. Selecting only a ligand list will display bioactivities measured on all the kinome by clicking the Search button. The query can be refined by specifying "Target" or "Bioactivity type" input field.

Ligand selection :

To select ligands and search selectivity in all the kinome, you can use inputs such as:

Target selection:

The list of targets can be obtained from :

  • Lists of :
    • Protein Names
    • Uniprot ID
    • Target ID
    • The Target ID is composed of the uniprot id concatenated with the information on a mutation by an underscore. (e.g. "P42336_Q546K")
  • Family

Bioactivity type selection :

The bioactivity data measured between ligands and kinases can be refined by bioactivity types (e.g. pIC50, pKd, pKi ...). There are two bioactivity groups :

  • pIC50, pKi, pKd and Potency (full dose response)
  • Inhibition, Activity and Residual Activity (single point)
These data can be regrouped because they where curated to be in the same units.

Interactive selectivity exploration

selectivity_heatmap.png

This is the representation of the selectivity for the previous selection. Each bioactivity data is extracted from the ChEMBL. When several values are available for a ligand-target pair, the mean is displayed. Borders of the heatmap are the protein-ligand pairs. Inactive values are colored in blue and active in red. The legend is compressed and does not show all names, you can zoom on the heatmap by selecting an area to completely display them.
Control buttons are available on the top right corner of the heatmap. In addition to zoom control, the heatmap can be saved as picture. Hovering the heatmap displays the name of the target in the corresponding column, the name of the ligand in the row and the mean of measured bioactivities. Data from heatmap can be downloaded as .csv or .xlsx to do further studies locally. The distinction between wild-type and mutated proteins is kept in the selectivity exploration. By clicking on one element of the heatmap, it will guide you to kinase-ligand complex details (sequence interface, 3D structure, bioactivity data).

3D structures and binding mode

binding_mode_query.png

This section is composed of three input fields which all select kinase-ligand pairs. Selecting at least one of the three inputs is required to search for 3D structures and binding modes. The search of kinase-ligands pairs to visualize is launched by clicking the Search button. If several inputs are specified, the list of the common pairs between each selection will be kept.

Similarity IFP :

This field allows or not searching for kinase-ligand interaction similarity. The result will be the list of all pairs interacting in the same way than the input. This search is based on Interaction fingerprints (IFP).

Ligand Selection :

To select pairs by picking its ligand, you can use inputs such as:

  • SDF file
  • Text areas for lists of :
    • InchiKey
    • PDB, and Ligand ID
    • This ID is composed of the PDB ID concatenated with the chain, the number of ligand and the PDB ligand ID by an underscore. (e.g. "1uwj_B_1_BAX")
  • SMILES for searching by :
    • Morgan Similarity (Maximum number of results : 50)
    • Substructure
    • The molecule can be drawn in the JSME molecular editor. Then, the SMILES code is gotten thanks to the Get SMILES button. The SMILES code can be pasted in JSME to get the 2D structure of the molecule. or converted to drawing using the Draw SMILES button.

Protein/ Complex Protein-Ligand Selection :

Kinase-ligand pairs can be selected by picking the protein or directly the pair itself:

  • Protein :
  • Protein-ligand complex
    • Lists of :
      • PDB ID
      • PDB and chain ID
      • This ID is composed of the PDB ID concatenated with the chain by an underscore. (e.g. "1ATP_A")

Interactive binding mode exploration

binding_mode_heatmap.png

This is the representation of the non-bounded interactions between ligands and residues in the ATP binding site of the selected protein kinase. Each of the 85 residues is represented by eight types of interactions :

  • (Column 0) hydrophobic contacts (HYD)
  • (Column 1) aromatic face to face (AFF)
  • (Column 2) aromatic edge to face (AEF)
  • (Column 3) hydrogen bond with protein as hydrogen bond donor (HBD)
  • (Column 4) hydrogen bond with protein as hydrogen bond acceptor (HBA)
  • (Column 5) salt bridges with positively charged protein (PSB)
  • (Column 6) salt bridges with negatively charged protein (NSB)
  • (Column 7) salt bridges having an ionic bond with metal ion (ISB)
To display the 680 interactions (85x8), the legend is compressed and does not show all residues and interactions. Interactions are encoded in two colors :

  • Absence of interaction
  • Presence of interaction

To get all residues you can zoom on the heatmap by selecting an area. Control buttons are available on the top right corner of the heatmap. In addition to zoom control, the heatmap can be saved as picture. To visualize all information, including bioactivity data on a ligand-target pair, you can click anywhere on a row of the heatmap.

Data from heatmap can be downloaded as .csv or .xlsx to do further studies locally.

Kinase-ligand complex details

visualization.png

This page provides the complete details on the kinase-ligand selected pair. It uses a URL that is unique for one result, you can copy it to find this result again.
Firstly the protein sequence annotation, with precious information such as natural variants. Then, on the left, ligand details with its structure and different identifiers. On the right, a picture from the kinase-ligand 3D complex and several identifiers are provided. As well as PyMOL and PyMOL Session files including annotations on the structure. Finally, all the values from the ChEMBL for the chosen ligand and protein (keeping information on the mutation) are placed in a table at the bottom of the page.

Data from this table can be extracted as xslx or csv files to do further studies on it locally. The table can be sorted on each columns. On the top right of the talbe a search bar is available to find precise information on the table. Several links on this page allow going back to initial information source (Uniprot, PDB or ChEMBL).