Structural analysis and insight into effector binding of the niacin-responsive repressor NiaR from Bacillus halodurans.

Dong Won Lee, Young Woo Park, Myung Yeon Lee, Kang Hwa Jeong, Jae Young Lee

Scientific reports 2020 Dec 03

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The niacin-responsive repressor, NiaR, is transcriptional repressor of certain nicotinamide adenine dinucleotide (NAD) biosynthetic genes in response to an increase in niacin levels. NAD is a vital molecule involved in various cellular redox reactions as an electron donor or electron acceptor. The NiaR family is conserved broadly in the Bacillus/Clostridium group, as well as in the Fusobacteria and Thermotogales lineages. The NiaR structure consists of two domains: an N-terminal DNA-binding domain, and a C-terminal regulation domain containing a metal-binding site. In this paper, we report the crystal structures of apo and niacin-bound forms of NiaR from Bacillus halodurans (BhNiaR). The analysis of metal-binding and niacin-binding sites through the apo and niacin-bound structures is described. Each N- and C-terminal domain structure of BhNiaR is almost identical with NiaR from Thermotoga maritima, but the overall domain arrangement is quite different. A zinc ion is fully occupied in each subunit with well-conserved residues in the C-terminal domain. Niacin is also located at a hydrophobic pocket near the zinc ion in the C-terminal domain.

Citation

Dong Won Lee, Young Woo Park, Myung Yeon Lee, Kang Hwa Jeong, Jae Young Lee. Structural analysis and insight into effector binding of the niacin-responsive repressor NiaR from Bacillus halodurans. Scientific reports. 2020 Dec 03;10(1):21039