AtomicChargeCalculator (ACC) is a tool that calculates, visualizes, and analyzes atomic charges in biomacromolecules and drug-like molecules. It allows users to upload molecules in supported formats, select an empirical method and parameters to calculate charges, and then examine the results including atomic and residue charges, statistics, and 3D visualizations of the charged structures. The guide walks users through the three step process of uploading molecules, setting up the calculation, and analyzing the output results.
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ACC: First Time Guide
1. AtomicChargeCalculator - ACC
First Time User Guide
DO: calculate, visualize and analyze
WHAT: atomic charges which respond to changes in molecular
conformation and chemical environment
WHERE: biomacromolecules and drug-like molecules.
3. Upload your protonated molecule in a supported format:
pdb, pqr, mol2, mol... Upload multiple molecules as .zip
Help...
Help...
Help...
Step 1 C Upload molecule(s)
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4. Once you chose the input file with molecule(s), click Upload.
Step 1 C Upload molecule(s)
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Help...
Help...
Help...
5. Help...
Once you upload your molecule(s), ACC tries to prepare a default
setup, so you can start your calculation immediately...
Step 2 C Setup
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Start
calculation
using default
setup
or check
and adjust
the setup
6. Help...
A default setup may not be available, or may not be optimal for
your calculation. Check and adjust each section of the setup...
Step 2 C Setup
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Check and
adjust the
setup
7. Help...
Check the total molecular charge (default=0)
Check the messages (missing H, suboptimal formatting...)
Total
molecular
charge
Step 2 C Setup
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8. Help...
EEM is an empirical approach used to calculate atomic charges.
Click Show sets to list all EEM parameter sets available in ACC.
EEM
parameters
Step 2 C Setup
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9. Help...Step 2 C Setup
For biomacromolecules, ACC provides time and memory efficient
implementations of EEM. Click Add to pick a suitable method.
Efficiency
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10. Help...Step 3 C Start
Keep the default settings or make your adjustments, then start
the calculation 10
11. try any of
the multiple
interactive
guides
... check the
tool tips
consult the
Wiki manual
Got lost during setup?
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12. Download structure files with charges (mol2, pqr...), statistics.
Unique URL available for later access
Retrieve results
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URL
Help...
13. Alternatively, for each molecule you can examine the results
directly in your browser...
Help...
URL
Retrieve results
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14. A job is defined by its unique setup (total molecular charge, set
of EEM parameters, computation method), and produces a
unique set of charges.
Help...
Examine results for each molecule - Summary
Molecule
Input and
computation warnings
Basic info about the
computation
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15. The charges can be inspected at two
levels of resolution:
- atomic charges
- residue charges (sum of atomic charges
per residue)
Help...
Examine results for each molecule C Raw Data
Molecule
Unique set of charges, resulted from a job
or read in from the input file
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16. Interesting statistics available for atomic and residue charges
Help...
Examine results for each molecule C Analyze
Molecule
The charge on
the Mg ions does
not vary much
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17. Help...
Examine results for each molecule C Compare
Molecule
Comparison between sets of charges resulted from different
jobs, or read from the input file 17
18. 3D model built using:
- atomic positions, colored by atomic charges or charge differences
- residue positions, colored by residue charges or charge differences
Help...
Examine results for each molecule C 3D Model
Molecule
Several visualization options to
help interpret the results
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19. try any of the multiple
interactive guides
... check the tool tips
consult the Wiki manual
Need help with interpreting the results?
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