1Z7R

Solution Structure of reduced glutaredoxin C1 from Populus tremula x tremuloides

1Z7R の概要

• エントリーDOI: 10.2210/pdb1z7r/pdb
• 関連するPDBエントリー: 1Z7P
• NMR情報: BMRB: 6410
• 分子名称: glutaredoxin (1 entity in total)
• 機能のキーワード: electron transport
• 由来する生物種: Populus tremula x Populus tremuloides
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 12529.31

構造登録者

Feng, Y.,Zhong, N.,Rouhier, N.,Jacquot, J.P.,Xia, B. (登録日: 2005-03-26, 公開日: 2006-03-28, 最終更新日: 2024-05-01)

主引用文献

Feng, Y.,Zhong, N.,Rouhier, N.,Hase, T.,Kusunoki, M.,Jacquot, J.P.,Jin, C.,Xia, B.
Structural Insight into Poplar Glutaredoxin C1 with a Bridging Iron-Sulfur Cluster at the Active Site
Biochemistry, 45:7998-8008, 2006

PubMed Abstract: Glutaredoxins are glutathione-dependent enzymes that function to reduce disulfide bonds in vivo. Interestingly, a recent discovery indicates that some glutaredoxins can also exist in another form, an iron-sulfur protein [Lillig, C. H., et al. (2005) Proc. Natl. Acad. Sci. U.S.A. 102, 8168-8173]. This provides a direct connection between glutaredoxins and iron-sulfur proteins, suggesting a possible new regulatory role of iron-sulfur clusters along with the new functional switch of glutaredoxins. Biochemical studies have indicated that poplar glutaredoxin C1 (Grx-C1) is also such a biform protein. The apo form (monomer) of Grx-C1 is a regular glutaredoxin, and the holo form (dimer) is an iron-sulfur protein with a bridging [2Fe-2S] cluster. Here, we report the structural characterizations of poplar Grx-C1 in both the apo and holo forms by NMR spectroscopy. The solution structure of the reduced apo Grx-C1, which is the first plant Grx structure, shows a typical Grx fold. When poplar Grx-C1 forms a dimer with an iron-sulfur cluster, each subunit of the holo form still retains the overall fold of the apo form. The bridging iron-sulfur cluster in holo Grx-C1 is coordinated near the active site. In addition to the iron-sulfur cluster linker, helix alpha3 of each subunit is probably involved in the direct contact between the two subunits. Moreover, two glutathione molecules are identified in the vicinity of the iron-sulfur cluster and very likely participate in cluster coordination. Taken together, we propose that the bridging [2Fe-2S] cluster is coordinated by the first cysteine at the glutaredoxin active site from each subunit of holo Grx-C1, along with two cysteines from two glutathione molecules. Our studies reveal that holo Grx-C1 has a novel structural and iron-sulfur cluster coordination pattern for an iron-sulfur protein.

PubMed: 16800625
DOI: 10.1021/bi060444t

実験手法

SOLUTION NMR