1M3U

Crystal Structure of Ketopantoate Hydroxymethyltransferase complexed the Product Ketopantoate

Summary for 1M3U

• Entry DOI: 10.2210/pdb1m3u/pdb
• Descriptor: 3-methyl-2-oxobutanoate hydroxymethyltransferase, MAGNESIUM ION, KETOPANTOATE, ... (4 entities in total)
• Functional Keywords: beta-alpha-barrel, tim-barrel, ketopantoate, selenomethionine mad, decamer, transferase
• Biological source: Escherichia coli
• Cellular location: Cytoplasm : P31057
• Total number of polymer chains: 10
• Total formula weight: 284348.23

Authors

von Delft, F.,Inoue, T.,Saldanha, S.A.,Ottenhof, H.H.,Dhanaraj, V.,Witty, M.,Abell, C.,Smith, A.G.,Blundell, T.L. (deposition date: 2002-06-30, release date: 2003-07-22, Last modification date: 2024-04-03)

Primary citation

von Delft, F.,Inoue, T.,Saldanha, S.A.,Ottenhof, H.H.,Schmitzberger, F.,Birch, L.M.,Dhanaraj, V.,Witty, M.,Smith, A.G.,Blundell, T.L.,Abell, C.
Structure of E. coli Ketopantoate Hydroxymethyl Transferase Complexed with Ketopantoate and Mg(2+), Solved by Locating 160 Selenomethionine Sites.
Structure, 11:985-996, 2003

PubMed Abstract: We report the crystal structure of E. coli ketopantoate hydroxymethyltransferase (KPHMT) at 1.9 A resolution, in complex with its product, ketopantoate. KPHMT catalyzes the first step in the biosynthesis of pantothenate (vitamin B(5)), the precursor of coenzyme A and the acyl carrier protein cofactor. The structure of the decameric enzyme was solved by multiwavelength anomalous dispersion to locate 160 selenomethionine sites and phase 560 kDa of protein, making it the largest structure solved by this approach. KPHMT adopts the (betaalpha)(8) barrel fold and is a member of the phosphoenolpyruvate/pyruvate superfamily. The active site contains a ketopantoate bidentately coordinated to Mg(2+). Similar binding is likely for the substrate, alpha-ketoisovalerate, orienting the C3 for deprotonation.

PubMed: 12906829
DOI: 10.1016/S0969-2126(03)00158-8

Experimental method

X-RAY DIFFRACTION (1.8 Å)