- PDB-3n6r: CRYSTAL STRUCTURE OF the holoenzyme of PROPIONYL-COA CARBOXYLASE (PCC) -
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基本情報
登録情報
データベース: PDB / ID: 3n6r
タイトル
CRYSTAL STRUCTURE OF the holoenzyme of PROPIONYL-COA CARBOXYLASE (PCC)
要素
Propionyl-CoA carboxylase, alpha subunit
Propionyl-CoA carboxylase, beta subunit
キーワード
LIGASE / protein complex / biotin-dependent carboxylase
機能・相同性
機能・相同性情報
propionate metabolic process / propionyl-CoA carboxylase / propionyl-CoA carboxylase activity / lipid catabolic process / ATP binding / metal ion binding 類似検索 - 分子機能
ジャーナル: Nature / 年: 2010 タイトル: Crystal structure of the alpha(6)beta(6) holoenzyme of propionyl-coenzyme A carboxylase. 著者: Christine S Huang / Kianoush Sadre-Bazzaz / Yang Shen / Binbin Deng / Z Hong Zhou / Liang Tong / 要旨: Propionyl-coenzyme A carboxylase (PCC), a mitochondrial biotin-dependent enzyme, is essential for the catabolism of the amino acids Thr, Val, Ile and Met, cholesterol and fatty acids with an odd ...Propionyl-coenzyme A carboxylase (PCC), a mitochondrial biotin-dependent enzyme, is essential for the catabolism of the amino acids Thr, Val, Ile and Met, cholesterol and fatty acids with an odd number of carbon atoms. Deficiencies in PCC activity in humans are linked to the disease propionic acidaemia, an autosomal recessive disorder that can be fatal in infants. The holoenzyme of PCC is an alpha(6)beta(6) dodecamer, with a molecular mass of 750 kDa. The alpha-subunit contains the biotin carboxylase (BC) and biotin carboxyl carrier protein (BCCP) domains, whereas the beta-subunit supplies the carboxyltransferase (CT) activity. Here we report the crystal structure at 3.2-A resolution of a bacterial PCC alpha(6)beta(6) holoenzyme as well as cryo-electron microscopy (cryo-EM) reconstruction at 15-A resolution demonstrating a similar structure for human PCC. The structure defines the overall architecture of PCC and reveals unexpectedly that the alpha-subunits are arranged as monomers in the holoenzyme, decorating a central beta(6) hexamer. A hitherto unrecognized domain in the alpha-subunit, formed by residues between the BC and BCCP domains, is crucial for interactions with the beta-subunit. We have named it the BT domain. The structure reveals for the first time the relative positions of the BC and CT active sites in the holoenzyme. They are separated by approximately 55 A, indicating that the entire BCCP domain must translocate during catalysis. The BCCP domain is located in the active site of the beta-subunit in the current structure, providing insight for its involvement in the CT reaction. The structural information establishes a molecular basis for understanding the large collection of disease-causing mutations in PCC and is relevant for the holoenzymes of other biotin-dependent carboxylases, including 3-methylcrotonyl-CoA carboxylase (MCC) and eukaryotic acetyl-CoA carboxylase (ACC).
履歴
登録
2010年5月26日
登録サイト: RCSB / 処理サイト: RCSB
改定 1.0
2010年8月25日
Provider: repository / タイプ: Initial release
改定 1.1
2011年7月13日
Group: Source and taxonomy / Version format compliance
モノクロメーター: SI(111) / プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray
放射波長
波長: 1.0809 Å / 相対比: 1
反射
解像度: 3.2→30 Å / Num. obs: 169648 / % possible obs: 92 % / 冗長度: 1.9 % / Rmerge(I) obs: 0.084 / Net I/σ(I): 8.6854
反射 シェル
解像度: 3.2→3.31 Å / 冗長度: 1.7 % / Rmerge(I) obs: 0.342 / Mean I/σ(I) obs: 2.024 / % possible all: 80
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解析
ソフトウェア
名称
バージョン
分類
CBASS
データ収集
PHASER
位相決定
CNS
1.2
精密化
DENZO
データ削減
SCALEPACK
データスケーリング
精密化
構造決定の手法: 分子置換 / 解像度: 3.2→29.36 Å / Rfactor Rfree error: 0.002 / Data cutoff high absF: 194743.4 / Data cutoff low absF: 0 / Isotropic thermal model: RESTRAINED / 交差検証法: THROUGHOUT / σ(F): 0 詳細: BULK SOLVENT MODEL USED. THE RESIDUES ARE NUMBERED ACCORDING TO THE HUMAN PCC SEQUENCE