2v84
From Proteopedia
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'''CRYSTAL STRUCTURE OF THE TP0655 (TPPOTD) LIPOPROTEIN OF TREPONEMA PALLIDUM''' | '''CRYSTAL STRUCTURE OF THE TP0655 (TPPOTD) LIPOPROTEIN OF TREPONEMA PALLIDUM''' | ||
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[[Category: Tomchick, D R.]] | [[Category: Tomchick, D R.]] | ||
[[Category: Ward, P.]] | [[Category: Ward, P.]] | ||
| - | [[Category: | + | [[Category: Abc transporter]] |
| - | [[Category: | + | [[Category: Lipoprotein]] |
| - | [[Category: | + | [[Category: Polyamine binding]] |
| - | [[Category: | + | [[Category: Putrescine]] |
| - | [[Category: | + | [[Category: Spermidine]] |
| - | [[Category: | + | [[Category: Syphili]] |
| - | [[Category: | + | [[Category: Transport protein]] |
| - | [[Category: | + | [[Category: Treponema pallidum]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 18:20:52 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 15:20, 4 May 2008
CRYSTAL STRUCTURE OF THE TP0655 (TPPOTD) LIPOPROTEIN OF TREPONEMA PALLIDUM
Overview
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.
About this Structure
2V84 is a Single protein structure of sequence from Treponema pallidum. Full crystallographic information is available from OCA.
Reference
Structural and biochemical basis for polyamine binding to the Tp0655 lipoprotein of Treponema pallidum: putative role for Tp0655 (TpPotD) as a polyamine receptor., Machius M, Brautigam CA, Tomchick DR, Ward P, Otwinowski Z, Blevins JS, Deka RK, Norgard MV, J Mol Biol. 2007 Oct 26;373(3):681-94. Epub 2007 Aug 21. PMID:17868688 Page seeded by OCA on Sun May 4 18:20:52 2008
