6QE5

Structure of E.coli RlmJ in complex with the natural cofactor product S-adenosyl-homocysteine (SAH)

6QE5 の概要

• エントリーDOI: 10.2210/pdb6qe5/pdb
• 分子名称: Ribosomal RNA large subunit methyltransferase J, S-ADENOSYL-L-HOMOCYSTEINE (3 entities in total)
• 機能のキーワード: rna mtases, methyltransferase, m6a, transition state analogue, inhibitor, rna binding, trmk, rlmj, m1a, structure., transferase
• 由来する生物種: Escherichia coli PCN033
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 69090.92

構造登録者

Oerum, S.,Catala, M.,Atdjian, C.,Brachet, F.,Ponchon, L.,Barraud, P.,Iannazzo, L.,Droogmans, L.,Braud, E.,Etheve-Quelquejeu, M.,Tisne, C. (登録日: 2019-01-04, 公開日: 2019-03-27, 最終更新日: 2025-12-10)

主引用文献

Oerum, S.,Catala, M.,Atdjian, C.,Brachet, F.,Ponchon, L.,Barraud, P.,Iannazzo, L.,Droogmans, L.,Braud, E.,Etheve-Quelquejeu, M.,Tisne, C.
Bisubstrate analogues as structural tools to investigate m6A methyltransferase active sites.
Rna Biol., 16:798-808, 2019

PubMed Abstract: RNA methyltransferases (MTases) catalyse the transfer of a methyl group to their RNA substrates using most-often S-adenosyl-L-methionine (SAM) as cofactor. Only few RNA-bound MTases structures are currently available due to the difficulties in crystallising RNA:protein complexes. The lack of complex structures results in poorly understood RNA recognition patterns and methylation reaction mechanisms. On the contrary, many cofactor-bound MTase structures are available, resulting in well-understood protein:cofactor recognition, that can guide the design of bisubstrate analogues that mimic the state at which both the substrate and the cofactor is bound. Such bisubstrate analogues were recently synthesized for proteins monomethylating the N6-atom of adenine (mA). These proteins include, amongst others, RlmJ in E. coli and METLL3:METT14 and METTL16 in human. As a proof-of-concept, we here test the ability of the bisubstrate analogues to mimic the substrate:cofactor bound state during catalysis by studying their binding to RlmJ using differential scanning fluorimetry, isothermal titration calorimetry and X-ray crystallography. We find that the methylated adenine base binds in the correct pocket, and thus these analogues could potentially be used broadly to study the RNA recognition and catalytic mechanism of mA MTases. Two bisubstrate analogues bind RlmJ with micro-molar affinity, and could serve as starting scaffolds for inhibitor design against mA RNA MTases. The same analogues cause changes in the melting temperature of the mA RNA MTase, TrmK, indicating non-selective protein:compound complex formation. Thus, optimization of these molecular scaffolds for mA RNA MTase inhibition should aim to increase selectivity, as well as affinity.

PubMed: 30879411
DOI: 10.1080/15476286.2019.1589360

実験手法

X-RAY DIFFRACTION (1.61 Å)