CNS MPO (CXN)

CATEGORY

Molecular Properties

SOURCE

ChemAxon

DESCRIPTION

Multi-Parameter Optimisation score for drugs targeted at the Central Nervous Systmem (CNS).

INPUTS

A dataset of molecules

OUTPUTS

A dataset of molecules

OPTIONS

Filter modeWhether to filter the molecules that pass or fail the filter, or to include all molecules
Filter rangeThe filter criteria if filtering. Choose values between 0 and 6.

ADDITIONAL INFO

The MPO approach predicts a number of molecular properties, normalises them, typically with 0 meaning bad and 1 meaning good, and sums the normalised scores. The normalisation process typically uses a “ramp” or “hump” function involving a linear change of the result score over a range of values and flat scores outside that range (or ranges). In the case of CNS MPO the properties and functions used are described below. Properties for each individual property and the resulting MPO score are added to each molecule. The result is a decimal number between 0 and 6, with “ideal” molecules scoring 6.

This approach is taken from Wagner et al., Moving beyond Rules: The Development of a Central Nervous System Multiparameter Optimization (CNS MPO) Approach To Enable Alignment of Druglike Properties, doi:10.1021/cn100008c, ACS Chem. Neurosci. (2010), 1, 435449.

The MPO CNS score is evaluated as follows:

Molecular propertyNormalising Function
LogPif value < 3 then 1
ramp from 1 to 0 over range of 3 to 5
if value >= 5 then 0
LogD at pH 7.4if value < 2 then 1
ramp from 1 to 0 over range of 2 to 4
if value >= 4 then 0
Molecular Weightif value < 360 then 1
ramp from 1 to 0 over range of 360 to 500
if value >= 500 then 0
TPSAif value < 20 then 0
ramp from 0 to 1 over range of 20 to 40
if value between 40 and 90 then 1
ramp from 1 to 0 over range of 90 to 120
if value >= 120 then 0
H-bond Donor Countif value = 0 then 1
if value = 1 then 0.75
if value = 2 then 0.5
if value = 3 then 0.25
if value >= 4 then 0
Most Basic pKaif value < 8 then 1
ramp from 1 to 0 over range of 8 to 10
if value >= 10 then 0

The best score possible is 6. The worst score possible is 0.

Properties are calculated using the ChemAxon property calculators.

Development of this cell was funded by Sygnature discovery.