Journal
ELIFE
Volume 2, Issue -, Pages -Publisher
ELIFE SCIENCES PUBLICATIONS LTD
DOI: 10.7554/eLife.00218
Keywords
-
Categories
Funding
- Max Planck Society
- PRESTO program, Japan Science and Technology Agency (JST)
Ask authors/readers for more resources
Methanogenic archaea use a [NiFe]-hydrogenase, Frh, for oxidation/reduction of F-420, an important hydride carrier in the methanogenesis pathway from H-2 and CO2. Frh accounts for about 1% of the cytoplasmic protein and forms a huge complex consisting of FrhABG heterotrimers with each a [NiFe] center, four Fe-S clusters and an FAD. Here, we report the structure determined by near-atomic resolution cryo-EM of Frh with and without bound substrate F-420. The polypeptide chains of FrhB, for which there was no homolog, was traced de novo from the EM map. The 1.2-MDa complex contains 12 copies of the heterotrimer, which unexpectedly form a spherical protein shell with a hollow core. The cryo-EM map reveals strong electron density of the chains of metal clusters running parallel to the protein shell, and the F-420-binding site is located at the end of the chain near the outside of the spherical structure.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available