Example Notebook: protein-ligand-benchmark

Related Publication

The preprint on “Best practices for constructing, preparing, and evaluating protein-ligand binding affinity benchmarks” provides accompanying information to this benchmark dataset and how to use it for alchemical free energy calculations. For any suggestions of improvements please raise an issue in its GitHub repository.

from plbenchmark import targets
from IPython.core.display import HTML

Warning: Unable to load toolkit 'OpenEye Toolkit'. The Open Force Field Toolkit does not require the OpenEye Toolkits, and can use RDKit/AmberTools instead. However, if you have a valid license for the OpenEye Toolkits, consider installing them for faster performance and additional file format support: https://docs.eyesopen.com/toolkits/python/quickstart-python/linuxosx.html OpenEye offers free Toolkit licenses for academics: https://www.eyesopen.com/academic-licensing

Get the whole set of targets in the dataset

# it is initialized from the `plbenchmark/sample_data/targets.yml` file
target_set = targets.TargetSet()
# to see which targets are available, one can get a list of names
target_set.get_names()

['mcl1_sample']

The TargetSet is a Dict, but can be converted to a pandas.DataFrame or a html string via TargetSet.get_dataframe(columns=None) or TargetSet.get_html(columns=None). The default None for columns means that all columns are printed. One can also define a subset of columns as a list:

HTML(target_set.get_html(columns=['name', 'fullname', 'pdb', 'references', 'numLigands', 'minDG', 'maxDG', 'associated_sets']))

/home/dhahn3/miniconda3/envs/plbenchmark/lib/python3.9/site-packages/pandas/core/dtypes/cast.py:1638: UnitStrippedWarning: The unit of the quantity is stripped when downcasting to ndarray.
  result[:] = values

	name	fullname	pdb	references	numLigands	minDG	maxDG	associated_sets
0	mcl1_sample	Induced myeloid leukemia cell differentiation protein Mcl-1	4HW3	{'calculation': ['10.1021/ja512751q', '10.1021/acs.jcim.9b00105'], 'measurement': None}	15	-9.0 kilocalorie / mole	-6.1 kilocalorie / mole	[Schrodinger JACS]

A target can be accessed with its name in two ways

mcl1 = target_set['mcl1_sample']
mcl1_2 = target_set.get_target('mcl1_sample')

The Target class

contains all the available information about one target of plbenchmark. It also has two member variables, _ligand_set and _edge_set, which contain the information about the available ligand and edges of the respective target. A Target can either be accessed from the TargetSet (see cell before) or initialized using its name via

mcl1 = targets.Target('mcl1_sample')
# The data in the column is stored in a pandas.Series and can be accessed via
mcl1.get_dataframe(columns=None)

/home/dhahn3/miniconda3/envs/plbenchmark/lib/python3.9/site-packages/pandas/core/dtypes/cast.py:1638: UnitStrippedWarning: The unit of the quantity is stripped when downcasting to ndarray.
  result[:] = values

associated_sets                                   [Schrodinger JACS]
comments            hydrophobic interactions contributing to binding
date                                                      2020-08-21
fullname           Induced myeloid leukemia cell differentiation ...
id                                                                99
ligands            [lig_23, lig_26, lig_27, lig_28, lig_29, lig_3...
name                                                     mcl1_sample
netcharge                                                         xx
pdb                                                             4HW3
references         {'calculation': ['10.1021/ja512751q', '10.1021...
numLigands                                                        15
maxDG                                        -6.1 kilocalorie / mole
minDG                                        -9.0 kilocalorie / mole
std(DG)                                       0.9 kilocalorie / mole
calculation        REP1http://dx.doi.org/10.1021/ja512751qREP2Wan...
pdblinks           REP1http://www.rcsb.org/structure/4HW3REP24HW3...
dtype: object

Access to the EdgeSet and LigandSet in different formats is achieved by

mcl1_ligands = mcl1.get_ligand_set()
mcl1_ligands_df = mcl1.get_ligand_set_dataframe()
HTML(mcl1.get_ligand_set_html(columns = ['name', 'ROMol', 'measurement', 'DerivedMeasurement']))

	name	ROMol	measurement						DerivedMeasurement
			comment	error	type	unit	value	Reference	type	value	error	unit
0	lig_23	dtype: object	Table 2, entry 23	30 nanomolar	ki	nanomolar	370 nanomolar	Friberg et al., J. Med. Chem. 2013	dg	-8.83 kilocalorie / mole	0.05 kilocalorie / mole	None
1	lig_26	dtype: object	Table 2, entry 26	0.44 micromolar	ki	micromolar	1.0 micromolar	Friberg et al., J. Med. Chem. 2013	dg	-8.24 kilocalorie / mole	0.26 kilocalorie / mole	None
2	lig_27	dtype: object	Table 3, entry 27	0.0071 millimolar	ki	millimolar	0.035 millimolar	Friberg et al., J. Med. Chem. 2013	dg	-6.12 kilocalorie / mole	0.12 kilocalorie / mole	None
3	lig_28	dtype: object	Table 3, entry 28, manually converted	0.03 kilocalorie / mole	dg	kilocalorie / mole	-6.62 kilocalorie / mole	Friberg et al., J. Med. Chem. 2013	dg	-6.62 kilocalorie / mole	0.03 kilocalorie / mole	None
4	lig_29	dtype: object	Table 3, entry 29, manually converted	120.0 calorie / mole	dg	calories / mole	-6940.0 calorie / mole	Friberg et al., J. Med. Chem. 2013	dg	-6.94 kilocalorie / mole	0.12 kilocalorie / mole	None
5	lig_30	dtype: object	Table 3, entry 30, manually converted	0.6 micromolar	ic50	micromolar	1.9 micromolar	Friberg et al., J. Med. Chem. 2013	dg	-7.85 kilocalorie / mole	0.19 kilocalorie / mole	None
6	lig_31	dtype: object	Table 3, entry 31, manually converted	80 nanomolar	ic50	nanomolar	1700 nanomolar	Friberg et al., J. Med. Chem. 2013	dg	-7.92 kilocalorie / mole	0.03 kilocalorie / mole	None
7	lig_32	dtype: object	Table 3, entry 32, manually converted	0.08 dimensionless	pic50	dimensionless	4.8 dimensionless	Friberg et al., J. Med. Chem. 2013	dg	-6.59 kilocalorie / mole	0.11 kilocalorie / mole	None
8	lig_33	dtype: object	Table 3, entry 33, manually converted	0.75 kilojoule / mole	dg	kilojoules / mole	-28.79 kilojoule / mole	Friberg et al., J. Med. Chem. 2013	dg	-6.880975143403441 kilocalorie / mole	0.17925430210325047 kilocalorie / mole	None
9	lig_34	dtype: object	Table 3, entry 34	3.2 micromolar	ki	micromolar	9.9 micromolar	Friberg et al., J. Med. Chem. 2013	dg	-6.87 kilocalorie / mole	0.19 kilocalorie / mole	None
10	lig_35	dtype: object	Table 3, entry 35	0.14 micromolar	ki	micromolar	0.38 micromolar	Friberg et al., J. Med. Chem. 2013	dg	-8.81 kilocalorie / mole	0.22 kilocalorie / mole	None
11	lig_36	dtype: object	Table 3, entry 36	0.1 micromolar	ki	micromolar	1.1 micromolar	Friberg et al., J. Med. Chem. 2013	dg	-8.18 kilocalorie / mole	0.05 kilocalorie / mole	None
12	lig_37	dtype: object	Table 3, entry 37	0.15 micromolar	ki	micromolar	0.3 micromolar	Friberg et al., J. Med. Chem. 2013	dg	-8.95 kilocalorie / mole	0.3 kilocalorie / mole	None
13	lig_38	dtype: object	Table 3, entry 38	2.1 micromolar	ki	micromolar	7.7 micromolar	Friberg et al., J. Med. Chem. 2013	dg	-7.02 kilocalorie / mole	0.16 kilocalorie / mole	None
14	lig_39	dtype: object	Table 3, entry 39	0.7 micromolar	ki	micromolar	7.6 micromolar	Friberg et al., J. Med. Chem. 2013	dg	-7.03 kilocalorie / mole	0.05 kilocalorie / mole	None

mcl1_edges = mcl1.get_edge_set()
mcl1_edges_df = mcl1.get_edge_set_dataframe()
HTML(mcl1.get_edge_set_html())

/home/dhahn3/miniconda3/envs/plbenchmark/lib/python3.9/site-packages/pandas/core/dtypes/cast.py:1638: UnitStrippedWarning: The unit of the quantity is stripped when downcasting to ndarray.
  result[:] = values

	ligand_a	ligand_b	name	Mol1	Smiles1	Mol2	Smiles2	exp. DeltaG [kcal/mol]	exp. Error [kcal/mol]
0	lig_28	lig_35	edge_28_35		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3C([H])([H])[H])[H])[H])[H])[H])[H])[H]		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])Cl)[H])[H])[H])[H]	-2.19 kilocalorie / mole	0.22 kilocalorie / mole
1	lig_30	lig_27	edge_30_27		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])[H])[H])[H])[H])[H]		[H]c1c(c(c(c(c1[H])[H])OC([H])([H])C([H])([H])C([H])([H])C2=C(N(c3c2c(c(c(c3[H])[H])[H])[H])[H])C(=O)[O-])[H])[H]	1.73 kilocalorie / mole	0.22 kilocalorie / mole
2	lig_31	lig_35	edge_31_35		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C(F)(F)F)[H])[H])[H])[H])[H]		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])Cl)[H])[H])[H])[H]	-0.89 kilocalorie / mole	0.22 kilocalorie / mole
3	lig_33	lig_27	edge_33_27		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])[H])Cl)[H])[H])[H])[H]		[H]c1c(c(c(c(c1[H])[H])OC([H])([H])C([H])([H])C([H])([H])C2=C(N(c3c2c(c(c(c3[H])[H])[H])[H])[H])C(=O)[O-])[H])[H]	0.76 kilocalorie / mole	0.22 kilocalorie / mole
4	lig_35	lig_33	edge_35_33		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])Cl)[H])[H])[H])[H]		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])[H])Cl)[H])[H])[H])[H]	1.93 kilocalorie / mole	0.28 kilocalorie / mole
5	lig_35	lig_37	edge_35_37		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])Cl)[H])[H])[H])[H]		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])Cl)C([H])([H])[H])[H])[H])[H]	-0.14 kilocalorie / mole	0.37 kilocalorie / mole
6	lig_39	lig_32	edge_39_32		[H]c1c(c(c(c(c1[H])[H])c2c(c(c(c(c2[H])[H])OC([H])([H])C([H])([H])C([H])([H])C3=C(N(c4c3c(c(c(c4[H])[H])[H])[H])[H])C(=O)[O-])[H])[H])[H])[H]		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])[H])C([H])([H])[H])[H])[H])[H])[H]	0.44 kilocalorie / mole	0.12 kilocalorie / mole

Finally, the set out of ligands and edges can be visualized in a graph:

graph = mcl1.get_graph()

The LigandSet and Ligand class

The LigandSet consists of a Dict of Ligands which are availabe for one target. It is accessible via Target.get_ligand_set(), but can also be initialized directly.

from plbenchmark import ligands

mcl1_ligands = ligands.LigandSet('mcl1_sample')
HTML(mcl1_ligands.get_html())

/home/dhahn3/miniconda3/envs/plbenchmark/lib/python3.9/site-packages/pandas/core/dtypes/cast.py:1638: UnitStrippedWarning: The unit of the quantity is stripped when downcasting to ndarray.
  result[:] = values

	name	smiles	measurement					DerivedMeasurement				ROMol	measurement
			comment	error	type	unit	value	type	value	error	unit		Reference
0	lig_23	[H]c1c(c(c2c(c1[H])c(c(c(c2OC([H])([H])C([H])([H])C([H])([H])C3=C(Sc4c3c(c(c(c4[H])[H])[H])[H])C(=O)[O-])[H])[H])[H])[H])[H]	Table 2, entry 23	30 nanomolar	ki	nanomolar	370 nanomolar	dg	-8.83 kilocalorie / mole	0.05 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
1	lig_26	[H]c1c(c(c2c(c1[H])c(c(c(c2OC([H])([H])C([H])([H])C([H])([H])C3=C(Oc4c3c(c(c(c4[H])[H])[H])[H])C(=O)[O-])[H])[H])[H])[H])[H]	Table 2, entry 26	0.44 micromolar	ki	micromolar	1.0 micromolar	dg	-8.24 kilocalorie / mole	0.26 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
2	lig_27	[H]c1c(c(c(c(c1[H])[H])OC([H])([H])C([H])([H])C([H])([H])C2=C(N(c3c2c(c(c(c3[H])[H])[H])[H])[H])C(=O)[O-])[H])[H]	Table 3, entry 27	0.0071 millimolar	ki	millimolar	0.035 millimolar	dg	-6.12 kilocalorie / mole	0.12 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
3	lig_28	[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3C([H])([H])[H])[H])[H])[H])[H])[H])[H]	Table 3, entry 28, manually converted	0.03 kilocalorie / mole	dg	kilocalorie / mole	-6.62 kilocalorie / mole	dg	-6.62 kilocalorie / mole	0.03 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
4	lig_29	[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3C(F)(F)F)[H])[H])[H])[H])[H])[H]	Table 3, entry 29, manually converted	120.0 calorie / mole	dg	calories / mole	-6940.0 calorie / mole	dg	-6.94 kilocalorie / mole	0.12 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
5	lig_30	[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])[H])[H])[H])[H])[H]	Table 3, entry 30, manually converted	0.6 micromolar	ic50	micromolar	1.9 micromolar	dg	-7.85 kilocalorie / mole	0.19 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
6	lig_31	[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C(F)(F)F)[H])[H])[H])[H])[H]	Table 3, entry 31, manually converted	80 nanomolar	ic50	nanomolar	1700 nanomolar	dg	-7.92 kilocalorie / mole	0.03 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
7	lig_32	[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])[H])C([H])([H])[H])[H])[H])[H])[H]	Table 3, entry 32, manually converted	0.08 dimensionless	pic50	dimensionless	4.8 dimensionless	dg	-6.59 kilocalorie / mole	0.11 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
8	lig_33	[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])[H])Cl)[H])[H])[H])[H]	Table 3, entry 33, manually converted	0.75 kilojoule / mole	dg	kilojoules / mole	-28.79 kilojoule / mole	dg	-6.880975143403441 kilocalorie / mole	0.17925430210325047 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
9	lig_34	[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])[H])C(F)(F)F)[H])[H])[H])[H]	Table 3, entry 34	3.2 micromolar	ki	micromolar	9.9 micromolar	dg	-6.87 kilocalorie / mole	0.19 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
10	lig_35	[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])Cl)[H])[H])[H])[H]	Table 3, entry 35	0.14 micromolar	ki	micromolar	0.38 micromolar	dg	-8.81 kilocalorie / mole	0.22 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
11	lig_36	[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])C([H])([H])[H])Cl)[H])[H])[H])[H]	Table 3, entry 36	0.1 micromolar	ki	micromolar	1.1 micromolar	dg	-8.18 kilocalorie / mole	0.05 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
12	lig_37	[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])Cl)C([H])([H])[H])[H])[H])[H]	Table 3, entry 37	0.15 micromolar	ki	micromolar	0.3 micromolar	dg	-8.95 kilocalorie / mole	0.3 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
13	lig_38	[H]c1c(c(c(c(c1[H])[H])c2c(c(c(c(c2[H])OC([H])([H])C([H])([H])C([H])([H])C3=C(N(c4c3c(c(c(c4[H])[H])[H])[H])[H])C(=O)[O-])[H])[H])[H])[H])[H]	Table 3, entry 38	2.1 micromolar	ki	micromolar	7.7 micromolar	dg	-7.02 kilocalorie / mole	0.16 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013
14	lig_39	[H]c1c(c(c(c(c1[H])[H])c2c(c(c(c(c2[H])[H])OC([H])([H])C([H])([H])C([H])([H])C3=C(N(c4c3c(c(c(c4[H])[H])[H])[H])[H])C(=O)[O-])[H])[H])[H])[H]	Table 3, entry 39	0.7 micromolar	ki	micromolar	7.6 micromolar	dg	-7.03 kilocalorie / mole	0.05 kilocalorie / mole	None	dtype: object	Friberg et al., J. Med. Chem. 2013

The Ligand classes can be accessed from the LigandSet by their name. Each Ligand has information about experimental data, references, SMILES string and SDF file path of the docked structure. Additionally, there are functions to derive and process the primary data, which is then added to the pandas.Series as a new entry.

lig_30 = mcl1_ligands['lig_30']
lig_27 = mcl1_ligands.get_ligand('lig_27')

The EdgeSet and Edge class

The EdgeSet contains a dict of Edges which are availabe for one target. It is accessible via Target.get_edge_set(), but can also be initialized directly.

from plbenchmark import edges

mcl1_edges = edges.EdgeSet('mcl1_sample')
HTML(mcl1_edges.get_html())

/home/dhahn3/miniconda3/envs/plbenchmark/lib/python3.9/site-packages/pandas/core/dtypes/cast.py:1638: UnitStrippedWarning: The unit of the quantity is stripped when downcasting to ndarray.
  result[:] = values

	ligand_a	ligand_b	name	Mol1	Smiles1	Mol2	Smiles2	exp. DeltaG [kcal/mol]	exp. Error [kcal/mol]
0	lig_28	lig_35	edge_28_35		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3C([H])([H])[H])[H])[H])[H])[H])[H])[H]		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])Cl)[H])[H])[H])[H]	-2.19 kilocalorie / mole	0.22 kilocalorie / mole
1	lig_30	lig_27	edge_30_27		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])[H])[H])[H])[H])[H]		[H]c1c(c(c(c(c1[H])[H])OC([H])([H])C([H])([H])C([H])([H])C2=C(N(c3c2c(c(c(c3[H])[H])[H])[H])[H])C(=O)[O-])[H])[H]	1.73 kilocalorie / mole	0.22 kilocalorie / mole
2	lig_31	lig_35	edge_31_35		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C(F)(F)F)[H])[H])[H])[H])[H]		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])Cl)[H])[H])[H])[H]	-0.89 kilocalorie / mole	0.22 kilocalorie / mole
3	lig_33	lig_27	edge_33_27		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])[H])Cl)[H])[H])[H])[H]		[H]c1c(c(c(c(c1[H])[H])OC([H])([H])C([H])([H])C([H])([H])C2=C(N(c3c2c(c(c(c3[H])[H])[H])[H])[H])C(=O)[O-])[H])[H]	0.76 kilocalorie / mole	0.22 kilocalorie / mole
4	lig_35	lig_33	edge_35_33		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])Cl)[H])[H])[H])[H]		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])[H])Cl)[H])[H])[H])[H]	1.93 kilocalorie / mole	0.28 kilocalorie / mole
5	lig_35	lig_37	edge_35_37		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])Cl)[H])[H])[H])[H]		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])Cl)C([H])([H])[H])[H])[H])[H]	-0.14 kilocalorie / mole	0.37 kilocalorie / mole
6	lig_39	lig_32	edge_39_32		[H]c1c(c(c(c(c1[H])[H])c2c(c(c(c(c2[H])[H])OC([H])([H])C([H])([H])C([H])([H])C3=C(N(c4c3c(c(c(c4[H])[H])[H])[H])[H])C(=O)[O-])[H])[H])[H])[H]		[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])[H])C([H])([H])[H])[H])[H])[H])[H]	0.44 kilocalorie / mole	0.12 kilocalorie / mole

mcl1_edges.keys()

dict_keys(['edge_28_35', 'edge_30_27', 'edge_31_35', 'edge_33_27', 'edge_35_33', 'edge_35_37', 'edge_39_32'])

The Edge classes can be accessed from the EdgeSet by their name. They are lightweight and provide only access to a pandas.DataFrame and a Dict:

edge_30_27 = mcl1_edges.get_edge('edge_30_27')
df = edge_30_27.get_dataframe()
edge_30_27.get_dict()

{'ligand_a': 'lig_30',
 'ligand_b': 'lig_27',
 'name': 'edge_30_27',
 'Mol1': <rdkit.Chem.rdchem.Mol at 0x7f1a3046e8e0>,
 'Smiles1': '[H]c1c(c(c2c(c1[H])C(=C(N2[H])C(=O)[O-])C([H])([H])C([H])([H])C([H])([H])Oc3c(c(c(c(c3[H])C([H])([H])[H])[H])[H])[H])[H])[H]',
 'Mol2': <rdkit.Chem.rdchem.Mol at 0x7f1a30460700>,
 'Smiles2': '[H]c1c(c(c(c(c1[H])[H])OC([H])([H])C([H])([H])C([H])([H])C2=C(N(c3c2c(c(c(c3[H])[H])[H])[H])[H])C(=O)[O-])[H])[H]',
 'exp. DeltaG [kcal/mol]': 1.73 <Unit('kilocalorie / mole')>,
 'exp. Error [kcal/mol]': 0.22 <Unit('kilocalorie / mole')>}