The crystal structure of D-xylonate dehydratase reveals functional features of enzymes from the Ilv/ED dehydratase family

Mohammad Mubinur Rahman, Martina Andberg, Anu Koivula, Juha Rouvinen, Nina Hakulinen

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)


The Ilv/ED dehydratase protein family includes dihydroxy acid-, gluconate-, 6-phosphogluconate- and pentonate dehydratases. The members of this family are involved in various biosynthetic and carbohydrate metabolic pathways. Here, we describe the first crystal structure of D-xylonate dehydratase from Caulobacter crescentus (CcXyDHT) at 2.7 Å resolution and compare it with other available enzyme structures from the IlvD/EDD protein family. The quaternary structure of CcXyDHT is a tetramer, and each monomer is composed of two domains in which the N-terminal domain forms a binding site for a [2Fe-2S] cluster and a Mg2+ ion. The active site is located at the monomer-monomer interface and contains residues from both the N-terminal recognition helix and the C-terminus of the dimeric counterpart. The active site also contains a conserved Ser490, which probably acts as a base in catalysis. Importantly, the cysteines that participate in the binding and formation of the [2Fe-2S] cluster are not all conserved within the Ilv/ED dehydratase family, which suggests that some members of the IlvD/EDD family may bind different types of [Fe-S] clusters.

Original languageEnglish
Article number865
JournalScientific Reports
Issue number1
Publication statusPublished - 1 Dec 2018
MoE publication typeA1 Journal article-refereed



  • Enzymes
  • X-ray crystallography

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