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-Structure paper
タイトル | Crystal structure and interaction studies of human DHTKD1 provide insight into a mitochondrial megacomplex in lysine catabolism. |
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ジャーナル・号・ページ | IUCrJ, Vol. 7, Issue Pt 4, Page 693-706, Year 2020 |
掲載日 | 2020年7月1日 |
著者 | Gustavo A Bezerra / William R Foster / Henry J Bailey / Kevin G Hicks / Sven W Sauer / Bianca Dimitrov / Thomas J McCorvie / Jürgen G Okun / Jared Rutter / Stefan Kölker / Wyatt W Yue / |
PubMed 要旨 | DHTKD1 is a lesser-studied E1 enzyme among the family of 2-oxoacid de-hydrogenases. In complex with E2 (di-hydro-lipo-amide succinyltransferase, DLST) and E3 (dihydrolipo-amide de-hydrogenase, DLD) ...DHTKD1 is a lesser-studied E1 enzyme among the family of 2-oxoacid de-hydrogenases. In complex with E2 (di-hydro-lipo-amide succinyltransferase, DLST) and E3 (dihydrolipo-amide de-hydrogenase, DLD) components, DHTKD1 is involved in lysine and tryptophan catabolism by catalysing the oxidative de-carboxyl-ation of 2-oxoadipate (2OA) in mitochondria. Here, the 1.9 Å resolution crystal structure of human DHTKD1 is solved in complex with the thi-amine diphosphate co-factor. The structure reveals how the DHTKD1 active site is modelled upon the well characterized homologue 2-oxoglutarate (2OG) de-hydrogenase but engineered specifically to accommodate its preference for the longer substrate of 2OA over 2OG. A 4.7 Å resolution reconstruction of the human DLST catalytic core is also generated by single-particle electron microscopy, revealing a 24-mer cubic scaffold for assembling DHTKD1 and DLD protomers into a megacomplex. It is further demonstrated that missense DHTKD1 variants causing the inborn error of 2-amino-adipic and 2-oxoadipic aciduria impact on the complex formation, either directly by disrupting the interaction with DLST, or indirectly through destabilizing the DHTKD1 protein. This study provides the starting framework for developing DHTKD1 modulators to probe the intricate mitochondrial energy metabolism. |
リンク | IUCrJ / PubMed:32695416 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 1.87 - 4.7 Å |
構造データ | EMDB-11014: PDB-6sy1: |
化合物 | ChemComp-TPP: ChemComp-MG: ChemComp-HOH: |
由来 |
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キーワード | STRUCTURAL GENOMICS / Dehydrogenase / transketolase / thiamine pyrophosphate / Mg / Structural Genomics Consortium / SGC |