Abstract:
:Copper-containing nitrite reductases (CuNiRs), encoded by nirK gene, are found in all kingdoms of life with only 5% of CuNiR denitrifiers having two or more copies of nirK Recently, we have identified two copies of nirK genes in several α-proteobacteria of the order Rhizobiales including Bradyrhizobium sp. ORS 375, encoding a four-domain heme-CuNiR and the usual two-domain CuNiR (Br2DNiR). Compared with two of the best-studied two-domain CuNiRs represented by the blue (AxNiR) and green (AcNiR) subclasses, Br2DNiR, a blue CuNiR, shows a substantially lower catalytic efficiency despite a sequence identity of ~70%. Advanced synchrotron radiation and x-ray free-electron laser are used to obtain the most accurate (atomic resolution with unrestrained SHELX refinement) and damage-free (free from radiation-induced chemistry) structures, in as-isolated, substrate-bound, and product-bound states. This combination has shed light on the protonation states of essential catalytic residues, additional reaction intermediates, and how catalytic efficiency is modulated.
journal_name
Sci Advjournal_title
Science advancesauthors
Rose SL,Antonyuk SV,Sasaki D,Yamashita K,Hirata K,Ueno G,Ago H,Eady RR,Tosha T,Yamamoto M,Hasnain SSdoi
10.1126/sciadv.abd8523subject
Has Abstractpub_date
2021-01-01 00:00:00issue
1issn
2375-2548pii
7/1/eabd8523journal_volume
7pub_type
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