Biochemical evidence for multiple dimeric states of the Sinorhizobium meliloti DctD receiver domain

Sungdae Park, Hong Zhang, A. Daniel Jones, B. Tracy Nixon

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

X-ray crystal structures suggest very different dimeric states for the inactive and active forms of the two-component receiver domain of Sinorhizobium meliloti DctD, a σ54-dependent AAA+ ATPase. Moreover, the receiver domain in crystals grown from unphosphorylated protein is refractory to phosphorylation whereas solution protein is fully phosphorylatable, and equilibrium analytical ultracentrifugation data are consistent with solution dimers for both phosphorylated and unphosphorylated forms of the protein. Here we report biochemical data consistent with the presence of multiple dimeric conformations in the inactive and active states, and evidence for significant change in the dimeric state upon activation by phosphorylation or binding of Mg2+ and BeF3-.

Original languageEnglish (US)
Pages (from-to)10934-10941
Number of pages8
JournalBiochemistry
Volume41
Issue number36
DOIs
StatePublished - Sep 2002

All Science Journal Classification (ASJC) codes

  • Biochemistry

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