3AHW

Crystal Structure of Ustilago sphaerogena Ribonuclease U2 complexed with adenosine 2'-monophosphate

3AHW の概要

• エントリーDOI: 10.2210/pdb3ahw/pdb
• 関連するPDBエントリー: 1RTU 3AGN 3AGO 3AHS
• 分子名称: Ribonuclease U2, ADENOSINE-2'-MONOPHOSPHATE, CALCIUM ION, ... (4 entities in total)
• 機能のキーワード: purine-specific endo-ribonuclease, hydrolase
• 由来する生物種: Ustilago sphaerogena (Smut fungus)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 12899.62

構造登録者

Noguchi, S. (登録日: 2010-05-04, 公開日: 2010-07-07, 最終更新日: 2024-10-16)

主引用文献

Noguchi, S.
Conformational variation revealed by the crystal structure of RNase U2A complexed with Ca ion and 2'-adenylic acid at 1.03 angstrom resolution.
Protein Pept.Lett., 17:1559-1561, 2010

PubMed Abstract: Asparagine can be non-enzymatically deamidated and isomerized via succinimide to isoaspartate. This post-translational modification can potentially alter the physical properties or the function of the parent protein. Asn32 of ribonuclease U2A from Ustilago sphaerogena is known to rapidly deamidate and isomerize in alkaline conditions. The crystal structure of ribonuclease U2A complexed with 2'-adenylic acid and calcium ions was determined at 1.03 Å resolution. In this structure, the region from Asp29 to Asp37 winds around a calcium ion, and the main-chain of Asn32-Gly33 adopts an extended conformation. Rotation of the side-chain of Asn32 could bring Asn32C(γ) into close proximity to Gly33N, in a conformation suitable for succinimide formation. The structure suggests that in solution the region around Asn32-Gly33 is likely to be in equilibrium between multiple conformers, with the deamidation of Asn32 proceeding when the region adopts an extended conformation.

PubMed: 20858208
DOI: 10.2174/0929866511009011559

実験手法

X-RAY DIFFRACTION (1.03 Å)