1O5L

Crystal structure of Transcriptional regulator (TM1171) from Thermotoga maritima at 2.30 A resolution

Summary for 1O5L

• Entry DOI: 10.2210/pdb1o5l/pdb
• Descriptor: transcriptional regulator, crp family (2 entities in total)
• Functional Keywords: tm1171, transcriptional regulator, crp family, structural genomics, jcsg, psi, protein structure initiative, joint center for structural genomics, transcription
• Biological source: Thermotoga maritima
• Total number of polymer chains: 1
• Total formula weight: 24895.19

Authors

Joint Center for Structural Genomics (JCSG) (deposition date: 2003-09-23, release date: 2003-10-07, Last modification date: 2024-05-22)

Primary citation

Spraggon, G.,Pantazatos, D.,Klock, H.E.,Wilson, I.A.,Woods, V.L.,Lesley, S.A.
On the use of DXMS to produce more crystallizable proteins: structures of the T. maritima proteins TM0160 and TM1171.
Protein Sci., 13:3187-3199, 2004

PubMed Abstract: The structure of two Thermotoga maritima proteins, a conserved hypothetical protein (TM0160) and a transcriptional regulator (TM1171), have now been determined at 1.9 A and 2.3 A resolution, respectively, as part of a large-scale structural genomics project. Our first efforts to crystallize full-length versions of these targets were unsuccessful. However, analysis of the recombinant purified proteins using the technique of enhanced amide hydrogen/deuterium exchange mass spectroscopy (DXMS) revealed substantial regions of rapid amide deuterium hydrogen exchange, consistent with flexible regions of the structures. Based on these exchange data, truncations were designed to selectively remove the disordered C-terminal regions, and the resulting daughter proteins showed greatly enhanced crystallizability. Comparative DXMS analysis of full-length protein versus truncated forms demonstrated complete and exact preservation of the exchange rate profiles in the retained sequence, indicative of conservation of the native folded structure. This study presents the first structures produced with the aid of the DXMS method for salvaging intractable crystallization targets. The structure of TM0160 represents a new fold and highlights the use of this approach where any prior structural knowledge is absent. The structure of TM1171 represents an example where the lack of a substrate/cofactor may impair crystallization. The details of both structures are presented and discussed.

PubMed: 15557262
DOI: 10.1110/ps.04939904

Experimental method

X-RAY DIFFRACTION (2.3 Å)