1L3C

MT0146, THE PRECORRIN-6Y METHYLTRANSFERASE (CBIT) HOMOLOG FROM M. THERMOAUTOTROPHICUM, C2 SPACEGROUP WITH SHORT CELL

1L3C の概要

• エントリーDOI: 10.2210/pdb1l3c/pdb
• 関連するPDBエントリー: 1F38 1KXZ 1L3B 1L3I
• 分子名称: Precorrin-6y methyltransferase/putative decarboxylase (2 entities in total)
• 機能のキーワード: structural genomics, beta barrel, rossmann fold, tetramer, methyltransferase, decarboxylase, structure-based function assignment, transferase, lyase
• 由来する生物種: Methanothermobacter thermautotrophicus
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 84448.52

構造登録者

Keller, J.P.,Smith, P.M.,Benach, J.,Christendat, D.,deTitta, G.,Hunt, J.F. (登録日: 2002-02-26, 公開日: 2002-11-27, 最終更新日: 2024-10-30)

主引用文献

Keller, J.P.,Smith, P.M.,Benach, J.,Christendat, D.,deTitta, G.,Hunt, J.F.
The Crystal Structure of Mt0146/Cbit Suggests that the Putative Precorrin-8W Decarboxylase is a Methyltransferase
Structure, 10:1475-1487, 2002

PubMed Abstract: The CbiT and CbiE enzymes participate in the biosynthesis of vitamin B12. They are fused together in some organisms to form a protein called CobL, which catalyzes two methylations and one decarboxylation on a precorrin intermediate. Because CbiE has sequence homology to canonical precorrin methyltransferases, CbiT was hypothesized to catalyze the decarboxylation. We herein present the crystal structure of MT0146, the CbiT homolog from Methanobacterium thermoautotrophicum. The protein shows structural similarity to Rossmann-like S-adenosyl-methionine-dependent methyltransferases, and our 1.9 A cocrystal structure shows that it binds S-adenosyl-methionine in standard geometry near a binding pocket that could accommodate a precorrin substrate. Therefore, MT0146/CbiT probably functions as a precorrin methyltransferase and represents the first enzyme identified with this activity that does not have the canonical precorrin methyltransferase fold.

PubMed: 12429089
DOI: 10.1016/S0969-2126(02)00876-6

実験手法

X-RAY DIFFRACTION (2.31 Å)