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Using reaction mechanism to measure enzyme similarity Noel M. O'Boyle , Gemma L. Holliday, Daniel E. Almonacid and John B.O. Mitchell Unilever Centre for Molecular Science Informatics, Dept. of Chemistry, University of Cambridge Journal of Molecular Biology ,  2007 ,  368 , 1484
[object Object],[object Object],[object Object],[object Object],Overview
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Enzyme similarity
Enzyme Commission (EC) Nomenclature, 1992, Academic Press, 6th Ed. EC classification of enzymes
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Disadvantages of EC system
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Solution Disadvantages of EC system To develop a measure of enzyme similarity based on the explicit catalytic mechanism
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],GL Holliday, GJ Bartlett, DE Almonacid, NM O’Boyle, P Murray-Rust, JM Thornton and JBO Mitchell,  Bioinformatics ,  2005 ,  21 , 4315 GL Holliday, DE Almonacid, GJ Bartlett, NM O’Boyle, JW Torrance, P Murray-Rust, JBO Mitchell and JM Thornton,  Nucleic Acids Research ,  2007 ,  35 , D515 MACiE
[object Object],[object Object],Similarity of Reaction Mechanisms
[object Object],Similarity of Reaction Mechanisms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],M0029, glutaminase (EC 3.5.1.38)
[object Object],Step 1 Step 1 M0029, glutaminase (EC 3.5.1.38)
[object Object],Step 1 Step 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],M0029, glutaminase (EC 3.5.1.38)
[object Object],Step 1 Step 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],M0029, glutaminase (EC 3.5.1.38)
[object Object],Step 1 Step 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Step similarity (Tanimoto coeff) = intersection / union = 3/(4+4-3) = 3/5 M0029, glutaminase (EC 3.5.1.38)
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],Step 1 Step 1 M0029, glutaminase (EC 3.5.1.38)
[object Object],Step 1 Step 1 X-H formed: 1 X-H cleaved: 1 C-O: 2 O-H: 1 N-H: 1 ES formed: 1 Formed: 2 Cleaved: 1 Order 2to1: 1 #N+: 1 #O-: 1 Change RtoP: 1 Molecularity: 3 M0029, glutaminase (EC 3.5.1.38)
[object Object],Step 1 Step 1 X-H formed: 1 X-H cleaved: 1 C-O: 2 O-H: 1 N-H: 1 ES formed: 1 Formed: 2 Cleaved: 1 Order 2to1: 1 #N+: 1 #O-: 1 Change RtoP: 1 Molecularity: 3 X-H formed: 1 X-H cleaved: 1 C-O: 2 O-H: 2 ES formed: 1 Formed: 2 Cleaved: 1 Order 2to1: 1 Change RtoP: 1 Molecularity: 3 M0029, glutaminase (EC 3.5.1.38)
[object Object],Step 1 Step 1 X-H formed: 1 X-H cleaved: 1 C-O: 2 O-H: 1 N-H: 1 ES formed: 1 Formed: 2 Cleaved: 1 Order 2to1: 1 #N+: 1 #O-: 1 Change RtoP: 1 Molecularity: 3 X-H formed: 1 X-H cleaved: 1 C-O: 2 O-H: 2 ES formed: 1 Formed: 2 Cleaved: 1 Order 2to1: 1 Change RtoP: 1 Molecularity: 3 Euclidean distance = sqrt(sum( [a i -b i ] 2  )) = 2 => normalised by max distance to 0.18 Similarity = 1 – normalised distance = 0.82 M0029, glutaminase (EC 3.5.1.38)
[object Object],[object Object],Similarity of Reaction Mechanisms
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],0.6 1.0 1.0 1.0 normalised similarity, S xy  =  Alignment score, A xy , of 3.6 Mechanism similarity M0029 Step 1 Step 2 Step 3 Step 4
Pairwise similarities in MACiE
Most similar pairs of reactions ,[object Object],9 8 7 6 5 4 3 2 1 Rank 3 0.58 M0007, M0021 3 0.64 M0062, M0063 2 0.67 M0002, M0029 1 0.69 M0092, M0100 0 0.75 M0032, M0033 1 0.76 M0005, M0094 3 0.78 M0017, M0091 0 1.00 M0011, M0040 0 1.00 M0026, M0041 0 1.00 M0027, M0035 no. of shared EC levels Similarity, S MACiE entries
Rank 13 (BC), 13 (FP) Mechanisms with high similarity Rank 1 (BC), 1 (FP) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],Same EC but different mechanism
[object Object],Correlation of EC code with mechanism similarity Increasing similarity
[object Object],Querying using Similarity Searching ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],Conclusions ,[object Object],[object Object],[object Object],Applications
Thanks for listening ,[object Object],Daniel Almonacid John Mitchell [email_address] J. Mol. Biol. ,  2007 ,  368 , 1484

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Using Reaction Mechanism to measure Enzyme Similarity

  • 1. Using reaction mechanism to measure enzyme similarity Noel M. O'Boyle , Gemma L. Holliday, Daniel E. Almonacid and John B.O. Mitchell Unilever Centre for Molecular Science Informatics, Dept. of Chemistry, University of Cambridge Journal of Molecular Biology , 2007 , 368 , 1484
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  • 4. Enzyme Commission (EC) Nomenclature, 1992, Academic Press, 6th Ed. EC classification of enzymes
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Editor's Notes

  1. First of all I’d like to thank the organisers of this session for giving me the chance to present this work. I’m going to describe some work which was carried out at the Unilever Centre,in Cambridge UK on using reaction mechanism to measure enzyme similarity.
  2. In cheminformatics we are very fond of the idea of similarity, particularly in terms of molecules. We expect similar molecules to have similar properties: similar biological properties, similar physical properties, and so on. There are many ways to measure similarity: for example, you could define similarity based on structure, or based on the values of particular descriptors. However, there is much less work done on measuring the similarity of reactions.
  3. In cheminformatics we are very fond of the idea of similarity, particularly in terms of molecules. We expect similar molecules to have similar properties: similar biological properties, similar physical properties, and so on. There are many ways to measure similarity: for example, you could define similarity based on structure, or based on the values of particular descriptors. However, there is much less work done on measuring the similarity of reactions.
  4. In cheminformatics we are very fond of the idea of similarity, particularly in terms of molecules. We expect similar molecules to have similar properties: similar biological properties, similar physical properties, and so on. There are many ways to measure similarity: for example, you could define similarity based on structure, or based on the values of particular descriptors. However, there is much less work done on measuring the similarity of reactions.