Abstract：
:The active site of [NiFe] hydrogenases contains a strictly conserved arginine that suspends a guanidine nitrogen atom <4.5 Å above the nickel and iron atoms. The guanidine headgroup interacts with the side chains of two conserved aspartic acid residues to complete an outer-shell canopy that has thus far proved intractable to investigation by site-directed mutagenesis. Using hydrogenase-1 from Escherichia coli, the strictly conserved residues R509 and D574 have been replaced by lysine (R509K) and asparagine (D574N) and the highly conserved D118 has been replaced by alanine (D118A) or asparagine (D118N/D574N). Each enzyme variant is stable, and their [(RS)2Niμ(SR)2Fe(CO)(CN)2] inner coordination shells are virtually unchanged. The R509K variant had >100-fold lower activity than native enzyme. Conversely, the variants D574N, D118A and D118N/D574N, in which the position of the guanidine headgroup is retained, showed 83%, 26% and 20% activity, respectively. The special kinetic requirement for R509 implicates the suspended guanidine group as the general base in H2 activation by [NiFe] hydrogenases.
journal_name
Nat Chem Bioljournal_title
Nature chemical biologyauthors
Evans RM,Brooke EJ,Wehlin SA,Nomerotskaia E,Sargent F,Carr SB,Phillips SE,Armstrong FAdoi
10.1038/nchembio.1976subject
Has Abstractpub_date
2016-01-01 00:00:00pages
46-50issue
1eissn
1552-4450issn
1552-4469pii
nchembio.1976journal_volume
12pub_type
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