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3NDN

Crystal structure of O-succinylhomoserine sulfhydrylase from Mycobacterium tuberculosis covalently bound to pyridoxal-5-phosphate

Summary for 3NDN
Entry DOI10.2210/pdb3ndn/pdb
DescriptorO-succinylhomoserine sulfhydrylase (2 entities in total)
Functional Keywordsseattle structural genomics center for infectious disease, ssgcid, mycobacterium, tuberculosis, plp, schiff base, transamination, lyase
Biological sourceMycobacterium tuberculosis
Total number of polymer chains4
Total formula weight178589.33
Authors
Seattle Structural Genomics Center for Infectious Disease (SSGCID) (deposition date: 2010-06-07, release date: 2010-06-16, Last modification date: 2023-11-22)
Primary citationBaugh, L.,Phan, I.,Begley, D.W.,Clifton, M.C.,Armour, B.,Dranow, D.M.,Taylor, B.M.,Muruthi, M.M.,Abendroth, J.,Fairman, J.W.,Fox, D.,Dieterich, S.H.,Staker, B.L.,Gardberg, A.S.,Choi, R.,Hewitt, S.N.,Napuli, A.J.,Myers, J.,Barrett, L.K.,Zhang, Y.,Ferrell, M.,Mundt, E.,Thompkins, K.,Tran, N.,Lyons-Abbott, S.,Abramov, A.,Sekar, A.,Serbzhinskiy, D.,Lorimer, D.,Buchko, G.W.,Stacy, R.,Stewart, L.J.,Edwards, T.E.,Van Voorhis, W.C.,Myler, P.J.
Increasing the structural coverage of tuberculosis drug targets.
Tuberculosis (Edinb), 95:142-148, 2015
Cited by
PubMed Abstract: High-resolution three-dimensional structures of essential Mycobacterium tuberculosis (Mtb) proteins provide templates for TB drug design, but are available for only a small fraction of the Mtb proteome. Here we evaluate an intra-genus "homolog-rescue" strategy to increase the structural information available for TB drug discovery by using mycobacterial homologs with conserved active sites. Of 179 potential TB drug targets selected for x-ray structure determination, only 16 yielded a crystal structure. By adding 1675 homologs from nine other mycobacterial species to the pipeline, structures representing an additional 52 otherwise intractable targets were solved. To determine whether these homolog structures would be useful surrogates in TB drug design, we compared the active sites of 106 pairs of Mtb and non-TB mycobacterial (NTM) enzyme homologs with experimentally determined structures, using three metrics of active site similarity, including superposition of continuous pharmacophoric property distributions. Pair-wise structural comparisons revealed that 19/22 pairs with >55% overall sequence identity had active site Cα RMSD <1 Å, >85% side chain identity, and ≥80% PSAPF (similarity based on pharmacophoric properties) indicating highly conserved active site shape and chemistry. Applying these results to the 52 NTM structures described above, 41 shared >55% sequence identity with the Mtb target, thus increasing the effective structural coverage of the 179 Mtb targets over three-fold (from 9% to 32%). The utility of these structures in TB drug design can be tested by designing inhibitors using the homolog structure and assaying the cognate Mtb enzyme; a promising test case, Mtb cytidylate kinase, is described. The homolog-rescue strategy evaluated here for TB is also generalizable to drug targets for other diseases.
PubMed: 25613812
DOI: 10.1016/j.tube.2014.12.003
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (1.85 Å)
Structure validation

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