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A knowledge-guided strategy for improving the accuracy of scoring functions in binding affinity prediction.

(2010) BMC Bioinformatics 11

PubMed: 20398404 | PubMedCentral: PMC2868011 | DOI: 10.1186/1471-2105-11-193

One can see that in one case (PDB entry 1O2O ) X-Score+KGS produced a notably larger error than X-Score alone.

Consequently, if X-Score+KGS is applied to predict the binding constant of 1O2O based on the known binding constant of 1O2K , it can only produce a binding score higher than the one of 1O2K , resulting in an even larger error (0.94 log units) than the one produced by X-Score alone (0.09 log units).

The experimental binding constants of complex 1O2O and its reference 1O2K (similarity = 0.58) are 6.36 and 6.92, respectively.

We have observed that X-Score also produced wrong rankings of some other pairs of trypsin complexes, but 1O2O / 1O2K is the one which contributes most to the larger deviations produced by X-Score+KGS on this test set.

Table 1 PDB codes of the protein-ligand complexes in the three test sets HIV protease complexes ( N = 112) 1GNM , 1GNN , 1GNO , 1A30 , 1A9M , 1AAQ , 1AJV , 1AJX , 1B6J , 1B6K , 1B6L , 1B6M , 1BDQ , 1BV7 , 1BV9 , 1BWA , 1BWB , 1C70 , 1D4K , 1D4L , 1D4Y , 1DIF , 1DMP , 1G2K , 1G35 , 1HBV , 1HEG , 1HIH , 1HII , 1HOS , 1HPO , 1HPS , 1HPV , 1HPX , 1HSH , 1HVH , 1HVI , 1HVJ , 1HVK , 1HVL , 1HVR , 1HVS , 1HWR , 1HXB , 1HXW , 1IIQ , 1IZH , 1IZI , 1LZQ , 1MES , 1MET , 1MEU , 1MRW , 1MRX , 1MSM , 1MSN , 1MTR , 1NH0 , 1ODY , 1OHR , 1PRO , 1QBR , 1QBS , 1QBT , 1QBU , 1SBG , 1SDT , 1SDU , 1SDV , 1SGU , 1SH9 , 1T7J , 1W5V , 1W5W , 1W5X , 1W5Y , 1Z1H , 1Z1R , 1ZP8 , 1ZPA , 1ZSF , 1ZSR , 2AOC , 2AOD , 2AOE , 2AQU , 2AVM , 2AVO , 2AVQ , 2AVS , 2AVV , 2BPV , 2BPY , 2BQV , 2F80 , 2F81 , 2F8G , 2FGU , 2FGV , 2HB3 , 2I0A , 2I0D , 7HVP , 7UPJ , 2HS2 , 2AOG , 2HS1 , 1A94 , 1AID , 1KZK , 1TCX , 3AID Trypsin complexes ( N = 73) 1C1R , 1C5P , 1C5Q , 1C5S , 1C5T , 1CE5 , 1F0T , 1F0U , 1K1I , 1K1J , 1K1L , 1K1M , 1K1N , 1OSS , 1PPC , 1PPH , 1QB1 , 1QB6 , 1QB9 , 1QBN , 1QBO , 1TNG , 1TNH , 1TNI , 1TNJ , 1TNK , 1TNL , 1V2J , 1V2K , 1V2L , 1V2N , 1V2Q , 1V2R , 1V2S , 1V2T , 1V2U , 1V2W , 2A31 , 2BZA , 2FX6 , 1BRA , 1G3B , 1G3C , 1G3D , 1G3E , 1GHZ , 1GI1 , 1GI4 , 1GI6 , 1GJ6 , 1J16 , 1J17 , 1O2H , 1O2J , 1O2K , 1O2N , 1O2O , 1O2Q , 1O2S , 1O2W , 1O2X , 1O2Z , 1O30 , 1O33 , 1O36 , 1O38 , 1O3D , 1O3F , 1O3H , 1O3I , 1O3J , 1O3K , 1V2O Carbonic anhydrase complexes ( N = 44) 1BN1 , 1BN3 , 1BN4 , 1BNN , 1BNQ , 1BNT , 1BNU , 1BNV , 1BNW , 1A42 , 1AVN , 1BCD , 1CIL , 1CIM , 1CIN , 1CNW , 1CNX , 1CNY , 1G1D , 1G45 , 1G46 , 1G48 , 1G4J , 1G4O , 1G52 , 1G53 , 1G54 , 1I9L , 1I9M , 1I9N , 1I9O , 1I9P , 1I9Q , 1IF7 , 1IF8 , 1OKL , 1TTM , 1XPZ , 1XQ0 , 1YDA , 1YDB , 1YDD , 2EZ7 , 2H4N In addition, a set of putative binding poses were prepared for the ligand molecule in each complex in all three test sets.

The ligand molecule in complex 1O2O has one additional fluorine atom at the ortho-position of the aminidino group as compared to the ligand in complex 1O2K , which reduces the binding constant by approximately three folds.

The binding scores produced by X-Score for complexes 1O2O and 1O2K are 6.27 and 6.08, respectively, giving a wrong ranking of these two complexes.

Table 4 Information on the six pairs of trypsin complexes with the highest similarities The query complex The reference complex PDB Code -log K d (exp) X-Score+ KGS X-Score PDB Code -log K d (exp) Similarity 1G3C 5.80 5.54 5.60 1G3E 5.38 0.67 1G3E 5.38 5.64 5.52 1G3C 5.80 0.67 1O2J 6.92 6.92 6.08 1O2K 6.92 0.58 1O2K 6.92 6.92 6.08 1O2J 6.92 0.58 1O2O 6.36 7.30 6.27 1O2K 6.92 0.58 1O38 6.82 6.48 6.33 1O2O 6.36 0.58 The above analysis suggests that failure of the KGS strategy in this case is caused directly by the intrinsic inaccuracy of the employed scoring function.

Publication Year: 2010