2V84

Crystal Structure of the Tp0655 (TpPotD) Lipoprotein of Treponema pallidum

2V84 の概要

• エントリーDOI: 10.2210/pdb2v84/pdb
• 分子名称: SPERMIDINE/PUTRESCINE ABC TRANSPORTER, PERIPLASMIC BINDING PROTEIN, 2-(N-MORPHOLINO)-ETHANESULFONIC ACID, CHLORIDE ION, ... (4 entities in total)
• 機能のキーワード: abc transporter, polyamine binding, treponema pallidum, syphilis, spermidine, putrescine, lipoprotein, transport protein
• 由来する生物種: TREPONEMA PALLIDUM
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 39710.79

構造登録者

Machius, M.,Brautigam, C.A.,Tomchick, D.R.,Ward, P.,Otwinowski, Z.,Blevine, J.S.,Deka, R.K.,Norgard, M.V. (登録日: 2007-08-02, 公開日: 2007-09-25, 最終更新日: 2024-05-08)

主引用文献

Machius, M.,Brautigam, C.A.,Tomchick, D.R.,Ward, P.,Otwinowski, Z.,Blevins, J.S.,Deka, R.K.,Norgard, M.V.
Structural and Biochemical Basis for Polyamine Binding to the Tp0655 Lipoprotein of Treponema Pallidum: Putative Role for Tp0655 (Tppotd) as a Polyamine Receptor.
J.Mol.Biol., 373:681-, 2007

PubMed Abstract: Tp0655 of Treponema pallidum, the causative agent of syphilis, is predicted to be a 40 kDa membrane lipoprotein. Previous sequence analysis of Tp0655 noted its homology to polyamine-binding proteins of the bacterial PotD family, which serve as periplasmic ligand-binding proteins of ATP-binding-cassette (ABC) transport systems. Here, the 1.8 A crystal structure of Tp0655 demonstrated structural homology to Escherichia coli PotD and PotF. The latter two proteins preferentially bind spermidine and putrescine, respectively. All of these proteins contain two domains that sandwich the ligand between them. The ligand-binding site of Tp0655 can be occupied by 2-(N-morpholino)ethanesulfanoic acid, a component of the crystallization medium. To discern the polyamine binding preferences of Tp0655, the protein was subjected to isothermal titration calorimetric experiments. The titrations established that Tp0655 binds polyamines avidly, with a marked preference for putrescine (Kd=10 nM) over spermidine (Kd=430 nM), but the related compounds cadaverine and spermine did not bind. Structural comparisons and structure-based sequence analyses provide insights into how polyamine-binding proteins recognize their ligands. In particular, these comparisons allow the derivation of rules that may be used to predict the function of other members of the PotD family. The sequential, structural, and functional homology of Tp0655 to PotD and PotF prompt the conclusion that the former likely is the polyamine-binding component of an ABC-type polyamine transport system in T. pallidum. We thus rename Tp0655 as TpPotD. The ramifications of TpPotD as a polyamine-binding protein to the parasitic strategy of T. pallidum are discussed.

PubMed: 17868688
DOI: 10.1016/J.JMB.2007.08.018

実験手法

X-RAY DIFFRACTION (1.78 Å)