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Solution NMR structure of CD1104B from pathogenic Clostridium difficile reveals a distinct α-helical architecture and provides first structural representative of protein domain family PF14203

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Journal of Structural and Functional Genomics

Abstract

A high-quality structure of the 68-residue protein CD1104B from Clostridium difficile strain 630 exhibits a distinct all α-helical fold. The structure presented here is the first representative of bacterial protein domain family PF14203 (currently 180 members) of unknown function (DUF4319) and reveals that the side-chains of the only two strictly conserved residues (Glu 8 and Lys 48) form a salt bridge. Moreover, these two residues are located in the vicinity of the largest surface cleft which is predicted to contribute to a surface area involved in protein–protein interactions. This, along with its coding in transposon CTn4, suggests that CD1104B (and very likely all members of Pfam 14203) functions by interacting with other proteins required for the transfer of transposons between different bacterial species.

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Fig. 1

Abbreviations

ABC:

ATP-binding cassette

CD:

Clostridium difficile

CTn:

Conjugative transposon

DSS:

4,4-dimethyl-4-silapentane-1-sulfonate sodium salt

DTT:

Dithiothreitol

DUF:

Domain of unknown function

MES:

2-(N-morpholino)ethanesulfonic acid

NESG:

Northeast Structural Genomics Consortium

NOE:

Nuclear overhauser effect

PDB:

Protein data bank

RDC:

Residual dipolar coupling

RMSD:

Root mean square deviation

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Acknowledgments

This work was supported by the National Institutes of Health, Grant Number: U54 GM094597 (T.S., J.H.P. and G.T.M.).

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Correspondence to Thomas Szyperski.

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Pulavarti, S.V.S.R.K., Eletsky, A., Lee, HW. et al. Solution NMR structure of CD1104B from pathogenic Clostridium difficile reveals a distinct α-helical architecture and provides first structural representative of protein domain family PF14203. J Struct Funct Genomics 14, 155–160 (2013). https://doi.org/10.1007/s10969-013-9164-8

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  • DOI: https://doi.org/10.1007/s10969-013-9164-8

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