4JLY

Dodecameric structure of spermidine N-acetyltransferase from Vibrio cholerae

4JLY の概要

• エントリーDOI: 10.2210/pdb4jly/pdb
• 関連するPDBエントリー: 3EG7
• 分子名称: Spermidine n1-acetyltransferase, SULFATE ION (3 entities in total)
• 機能のキーワード: structural genomics, niaid, national institute of allergy and infectious diseases, center for structural genomics of infectious diseases, csgid, spermidine, n-acetyltransferase, transferase
• 由来する生物種: Vibrio cholerae O1 biovar eltor
• 細胞内の位置: Cytoplasm : Q9KL03
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 126334.19

構造登録者

Filippova, E.V.,Minasov, G.,Shuvalova, L.,Kiryukhina, O.,Kuhn, M.L.,Anderson, W.F.,Center for Structural Genomics of Infectious Diseases (CSGID) (登録日: 2013-03-13, 公開日: 2013-04-03, 最終更新日: 2023-09-20)

主引用文献

Filippova, E.V.,Weigand, S.,Osipiuk, J.,Kiryukhina, O.,Joachimiak, A.,Anderson, W.F.
Substrate-Induced Allosteric Change in the Quaternary Structure of the Spermidine N-Acetyltransferase SpeG.
J.Mol.Biol., 427:3538-3553, 2015

PubMed Abstract: The spermidine N-acetyltransferase SpeG is a dodecameric enzyme that catalyzes the transfer of an acetyl group from acetyl coenzyme A to polyamines such as spermidine and spermine. SpeG has an allosteric polyamine-binding site and acetylating polyamines regulate their intracellular concentrations. The structures of SpeG from Vibrio cholerae in complexes with polyamines and cofactor have been characterized earlier. Here, we present the dodecameric structure of SpeG from V. cholerae in a ligand-free form in three different conformational states: open, intermediate and closed. All structures were crystallized in C2 space group symmetry and contain six monomers in the asymmetric unit cell. Two hexamers related by crystallographic 2-fold symmetry form the SpeG dodecamer. The open and intermediate states have a unique open dodecameric ring. This SpeG dodecamer is asymmetric except for the one 2-fold axis and is unlike any known dodecameric structure. Using a fluorescence thermal shift assay, size-exclusion chromatography with multi-angle light scattering, small-angle X-ray scattering analysis, negative-stain electron microscopy and structural analysis, we demonstrate that this unique open dodecameric state exists in solution. Our combined results indicate that polyamines trigger conformational changes and induce the symmetric closed dodecameric state of the protein when they bind to their allosteric sites.

PubMed: 26410587
DOI: 10.1016/j.jmb.2015.09.013

実験手法

X-RAY DIFFRACTION (2.882 Å)