A membrane-bound [NiFe]-hydrogenase large subunit precursor whose C-terminal extension is not essential for cofactor incorporation but guarantees optimal maturation.

Abstract:

:[NiFe]-hydrogenases catalyze the reversible conversion of molecular hydrogen into protons end electrons. This reaction takes place at a NiFe(CN)2 (CO) cofactor located in the large subunit of the bipartite hydrogenase module. The corresponding apo-protein carries usually a C-terminal extension that is cleaved off by a specific endopeptidase as soon as the cofactor insertion has been accomplished by the maturation machinery. This process triggers complex formation with the small, electron-transferring subunit of the hydrogenase module, revealing catalytically active enzyme. The role of the C-terminal extension in cofactor insertion, however, remains elusive. We have addressed this problem by using genetic engineering to remove the entire C-terminal extension from the apo-form of the large subunit of the membrane-bound [NiFe]-hydrogenase (MBH) from Ralstonia eutropha. Unexpectedly, the MBH holoenzyme derived from this precleaved large subunit was targeted to the cytoplasmic membrane, conferred H2 -dependent growth of the host strain, and the purified protein showed exactly the same catalytic activity as native MBH. The only difference was a reduced hydrogenase content in the cytoplasmic membrane. These results suggest that in the case of the R. eutropha MBH, the C-terminal extension is dispensable for cofactor insertion and seems to function only as a maturation facilitator.

journal_name

Microbiologyopen

journal_title

MicrobiologyOpen

authors

Hartmann S,Frielingsdorf S,Caserta G,Lenz O

doi

10.1002/mbo3.1029

subject

Has Abstract

pub_date

2020-06-01 00:00:00

pages

1197-1206

issue

6

issn

2045-8827

journal_volume

9

pub_type

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