Protein Family Models

Radical SAM proteins catalyse diverse reactions, including unusual methylations, isomerisation, sulphur insertion, ring formation, anaerobic oxidation and protein radical formation. [1]. 11222759. Radical SAM, a novel protein superfamily linking unresolved steps in familiar biosynthetic pathways with radical mechanisms: functional characterization using new analysis and information visualization methods. Sofia HJ, Chen G, Hetzler BG, Reyes-Spindola JF, Miller NE;. Nucleic Acids Res 2001;29:1097-1106. [2]. 17335281. Anaerobic sulfatase-maturating enzymes: radical SAM enzymes able to catalyze in vitro sulfatase post-translational modification. Benjdia A, Leprince J, Guillot A, Vaudry H, Rabot S, Berteau O;. J Am Chem Soc. 2007;129:3462-3463. [3]. 16766528. A new type of bacterial sulfatase reveals a novel maturation pathway in prokaryotes. Berteau O, Guillot A, Benjdia A, Rabot S;. J Biol Chem. 2006;281:22464-22470. (from Pfam)

Date:

2024-10-16

heme anaerobic degradation radical SAM methyltransferase ChuW/HutW is a class C radical SAM methyltransferase that catalyzes the methylation of an sp2-hybridized carbon atom, and the reductive cleavage of SAM functions as as the starting point of the catalytic cycle; radical SAM protein generates radicals by combining a 4Fe-4S cluster and S-adenosylmethionine (SAM) in close proximity; contains a conserved CxxxCxxC motif, which coordinates the conserved iron-sulfur cluster; transfer of a single electron from the iron-sulfur cluster to SAM leads to its reductive cleavage to methionine and a 5'-deoxyadenosyl radical

Date:

2022-10-05

HutW is a radical SAM enzyme closely related to HemN, the heme biosynthetic oxygen-independent coproporphyrinogen oxidase. It belongs to operons associated with heme uptake and utilization in Vibrio cholerae and related species, but neither it not HutX has been shown to be needed, as is HutZ, for heme utilization. HutW failed to complement a Salmonella enterica hemN mutant (PMID:15205415), suggesting a related but distinct activity. Some members of this family are fused to hutX.

Gene:

hutW

Date:

2021-09-15