4RTB

X-ray structure of the FeFe-hydrogenase maturase HydG from Carboxydothermus hydrogenoformans

Summary for 4RTB

• Entry DOI: 10.2210/pdb4rtb/pdb
• Descriptor: HydG protein, S-ADENOSYLMETHIONINE, IRON/SULFUR CLUSTER, ... (5 entities in total)
• Functional Keywords: radical sam enzyme, co/cn synthase, fefe-hydrogenase maturase, lyase
• Biological source: Carboxydothermus hydrogenoformans
• Total number of polymer chains: 1
• Total formula weight: 55647.26

Authors

Nicolet, Y.,Pagnier, A.,Zeppieri, L.,Martin, L.,Amara, P.,Fontecilla-Camps, J.C. (deposition date: 2014-11-14, release date: 2015-01-28, Last modification date: 2023-09-20)

Primary citation

Nicolet, Y.,Pagnier, A.,Zeppieri, L.,Martin, L.,Amara, P.,Fontecilla-Camps, J.C.
Crystal Structure of HydG from Carboxydothermus hydrogenoformans: A Trifunctional [FeFe]-Hydrogenase Maturase.
Chembiochem, 16:397-402, 2015

PubMed Abstract: The structure of the radical S-adenosyl-L-methionine (SAM) [FeFe]-hydrogenase maturase HydG involved in CN(-) /CO synthesis is characterized by two internal tunnels connecting its tyrosine-binding pocket with the external medium and the C-terminal Fe4 S4 cluster-containing region. A comparison with a tryptophan-bound NosL structure suggests that substrate binding causes the closing of the first tunnel and, along with mutagenesis studies, that tyrosine binds to HydG with its amino group well positioned for H-abstraction by SAM. In this orientation the dehydroglycine (DHG) fragment caused by tyrosine Cα-Cβ bond scission can readily migrate through the second tunnel towards the C-terminal domain where both CN(-) and CO are synthesized. Our HydG structure appears to be in a relaxed state with its C-terminal cluster CysX2 CysX22 Cys motif exposed to solvent. A rotation of this domain coupled to Fe4 S4 cluster assembly would bury its putatively reactive unique Fe ion thereby allowing it to interact with DHG.

PubMed: 25504963
DOI: 10.1002/cbic.201402661

Experimental method

X-RAY DIFFRACTION (2.79 Å)