ジャーナル: Structure / 年: 2013 タイトル: Structure and conformational variability of the mycobacterium tuberculosis fatty acid synthase multienzyme complex. 著者: Luciano Ciccarelli / Sean R Connell / Mathias Enderle / Deryck J Mills / Janet Vonck / Martin Grininger / 要旨: Antibiotic therapy in response to Mycobacterium tuberculosis infections targets de novo fatty acid biosynthesis, which is orchestrated by a 1.9 MDa type I fatty acid synthase (FAS). Here, we ...Antibiotic therapy in response to Mycobacterium tuberculosis infections targets de novo fatty acid biosynthesis, which is orchestrated by a 1.9 MDa type I fatty acid synthase (FAS). Here, we characterize M. tuberculosis FAS by single-particle cryo-electron microscopy and interpret the data by docking the molecular models of yeast and Mycobacterium smegmatis FAS. Our analysis reveals a porous barrel-like structure of considerable conformational variability that is illustrated by the identification of several conformational states with altered topology in the multienzymatic assembly. This demonstrates that the barrel-like structure of M. tuberculosis FAS is not just a static scaffold for the catalytic domains, but may play an active role in coordinating fatty acid synthesis. The conception of M. tuberculosis FAS as a highly dynamic assembly of domains revises the view on bacterial type I fatty acid synthesis and might inspire new strategies for inhibition of de novo fatty acid synthesis in M. tuberculosis.
SHEET DETERMINATION METHOD: DSSP THE SHEETS PRESENTED AS "DB" IN EACH CHAIN ON SHEET RECORDS BELOW ... SHEET DETERMINATION METHOD: DSSP THE SHEETS PRESENTED AS "DB" IN EACH CHAIN ON SHEET RECORDS BELOW IS ACTUALLY AN 8-STRANDED BARREL THIS IS REPRESENTED BY A 9-STRANDED SHEET IN WHICH THE FIRST AND LAST STRANDS ARE IDENTICAL. THE SHEETS PRESENTED AS "ED" IN EACH CHAIN ON SHEET RECORDS BELOW IS ACTUALLY AN 8-STRANDED BARREL THIS IS REPRESENTED BY A 9-STRANDED SHEET IN WHICH THE FIRST AND LAST STRANDS ARE IDENTICAL. THE SHEETS PRESENTED AS "FD" IN EACH CHAIN ON SHEET RECORDS BELOW IS ACTUALLY AN 8-STRANDED BARREL THIS IS REPRESENTED BY A 9-STRANDED SHEET IN WHICH THE FIRST AND LAST STRANDS ARE IDENTICAL.
モード: BRIGHT FIELD / 倍率(公称値): 59000 X / 最大 デフォーカス(公称値): 4500 nm / 最小 デフォーカス(公称値): 1800 nm
撮影
フィルム・検出器のモデル: KODAK SO-163 FILM
放射波長
相対比: 1
-
解析
EMソフトウェア
ID
名称
バージョン
カテゴリ
1
EMAN
2
3次元再構成
2
SPARX
3次元再構成
対称性
点対称性: C1 (非対称)
3次元再構成
解像度: 17.5 Å / 粒子像の数: 9136 詳細: THE MODEL IS DERIVED FROM PDB ENTRY 3ZEN BOEHRINGER ET AL., 2013 AND REPRESENTS A RIGID BODY DOCKING OF THE MODEL INTO A CRYO-EM MAP. IN CHAIN F THE MAT AND DH DOMAINS WHERE FIT INDEPENDENTLY ...詳細: THE MODEL IS DERIVED FROM PDB ENTRY 3ZEN BOEHRINGER ET AL., 2013 AND REPRESENTS A RIGID BODY DOCKING OF THE MODEL INTO A CRYO-EM MAP. IN CHAIN F THE MAT AND DH DOMAINS WHERE FIT INDEPENDENTLY OF THE REST OF THE MODEL. IN CHAIN D, RESIDUES 1- 400 (AT DOMAIN) WERE DELETED AS THE DENSITY OF THE EM MAP IN THAT REGION IS FRAGMENTED DUE TO FLEXIBILITY. SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-2357. (DEPOSITION ID: 11618). 対称性のタイプ: POINT
原子モデル構築
プロトコル: RIGID BODY FIT / 空間: REAL / 詳細: METHOD--RIGID BODY REFINEMENT PROTOCOL--RIGID BODY