4099-81-4Relevant articles and documents
Characterization and Mechanistic Study of the Radical SAM Enzyme ArsS Involved in Arsenosugar Biosynthesis
Cheng, Jinduo,Ji, Wenjuan,Ma, Suze,Ji, Xinjian,Deng, Zixin,Ding, Wei,Zhang, Qi
supporting information, p. 7570 - 7575 (2021/03/01)
Arsenosugars are a group of arsenic-containing ribosides that are found predominantly in marine algae but also in terrestrial organisms. It has been proposed that arsenosugar biosynthesis involves a key intermediate 5′-deoxy-5′-dimethylarsinoyl-adenosine (DDMAA), but how DDMAA is produced remains elusive. Now, we report characterization of ArsS as a DDMAA synthase, which catalyzes a radical S-adenosylmethionine (SAM)-mediated alkylation (adenosylation) of dimethylarsenite (DMAsIII) to produce DDMAA. This radical-mediated reaction is redox neutral, and multiple turnover can be achieved without external reductant. Phylogenomic and biochemical analyses revealed that DDMAA synthases are widespread in distinct bacterial phyla with similar catalytic efficiencies; these enzymes likely originated from cyanobacteria. This study reveals a key step in arsenosugar biosynthesis and also a new paradigm in radical SAM chemistry, highlighting the catalytic diversity of this superfamily of enzymes.
Nicotinamide-Containing Di- and Trinucleotides as Chemical Tools for Studies of NAD-Capped RNAs
Mlynarska-Cieslak, Agnieszka,Depaix, Anais,Grudzien-Nogalska, Ewa,Sikorski, Pawel J.,Warminski, Marcin,Kiledjian, Megerditch,Jemielity, Jacek,Kowalska, Joanna
, p. 7650 - 7655 (2019/01/03)
We report the chemical synthesis of a set of nicotinamide adenine dinucleotide (NAD) cap analogues containing chemical modifications that reduce their susceptibility to NAD-RNA-degrading enzymes. These analogues can be incorporated into transcripts in a similar way as NAD. Biochemical characterization of RNAs carrying these caps with DXO, NudC, and Nudt12 enzymes led to the identification of compounds that can be instrumental in unraveling so far unaddressed biological aspects of NAD-RNAs.
Large-scale, protection-free synthesis of Se-adenosyl-l-selenomethionine analogues and their application as cofactor surrogates of methyltransferases
Bothwell, Ian R.,Luo, Minkui
supporting information, p. 3056 - 3059 (2014/06/23)
S-Adenosyl-l-methionine (SAM) analogues have previously demonstrated their utility as chemical reporters of methyltransferases. Here we describe the facile, large-scale synthesis of Se-alkyl Se-adenosyl-l-selenomethionine (SeAM) analogues and their precursor, Se-adenosyl-l-selenohomocysteine (SeAH). Comparison of SeAM analogues with their equivalent SAM analogues suggests that sulfonium-to-selenonium substitution can enhance their compatibility with certain protein methyltransferases, favoring otherwise less reactive SAM analogues. Ready access to SeAH therefore enables further application of SeAM analogues as chemical reporters of diverse methyltransferases.