Structural basis for the specialization of Nur, a nickel-specific Fur homolog, in metal sensing and DNA recognition

Young Jun An, Bo Eun Ahn, A. Reum Han, Hae Mi Kim, Kyung Min Chung, Jung Ho Shin, Yoo Bok Cho, Jung Hye Roe, Sun Shin Cha

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

Nur, a member of the Fur family, is a nickel-responsive transcription factor that controls nickel homeostasis and anti-oxidative response in Streptomyces coelicolor. Here we report the 2.4-Å resolution crystal structure of Nur. It contains a unique nickel-specific metal site in addition to a nonspecific common metal site. The identification of the 6-5-6 motif of the Nur recognition box and a Nur/DNA complex model reveals that Nur mainly interacts with terminal bases of the palindrome on complex formation. This contrasts with more distributed contacts between Fur and the n-1-n type of the Fur-binding motif. The disparity between Nur and Fur in the conformation of the S1-S2 sheet in the DNA-binding domain can explain their different DNA-recognition patterns. Furthermore, the fact that the specificity of Nur in metal sensing and DNA recognition is conferred by the specific metal site suggests that its introduction drives the evolution of Nur orthologs in the Fur family.

Original languageEnglish
Pages (from-to)3442-3451
Number of pages10
JournalNucleic Acids Research
Volume37
Issue number10
DOIs
StatePublished - 2009

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