2XT2 image
Entry Detail
PDB ID:
2XT2
Keywords:
Title:
Structure of the pentapeptide repeat protein AlbG, a resistance factor for the topoisomerase poison albicidin.
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2010-10-05
Release Date:
2010-10-13
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.21
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:MCBG-LIKE PROTEIN
Chain IDs:A, B
Chain Length:200
Number of Molecules:2
Biological Source:XANTHOMONAS ALBILINEANS
Ligand Molecules
Primary Citation
Pentapeptide-Repeat Proteins that Act as Topoisomerase Poison Resistance Factors Have a Common Dimer Interface.
Acta Crystallogr.,Sect.F 67 296 ? (2011)
PMID: 21393830 DOI: 10.1107/S1744309110053315

Abstact

The protein AlbG is a self-resistance factor against albicidin, a nonribosomally encoded hybrid polyketide-peptide with antibiotic and phytotoxic properties produced by Xanthomonas albilineans. Primary-sequence analysis indicates that AlbG is a member of the pentapeptide-repeat family of proteins (PRP). The structure of AlbG from X. albilineans was determined at 2.0 Å resolution by SAD phasing using data collected from a single trimethyllead acetate derivative on a home source. AlbG folds into a right-handed quadrilateral β-helix composed of approximately eight semi-regular coils. The regularity of the β-helix is blemished by a large loop/deviation in the β-helix between coils 4 and 5. The C-terminus of the β-helix is capped by a dimerization module, yielding a dimer with a 110 Å semi-collinear β-helical axis. This method of dimer formation appears to be common to all PRP proteins that confer resistance to topoisomerase poisons and contrasts with most PRP proteins, which are typically monomeric.

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