5E27 image
Entry Detail
PDB ID:
5E27
Keywords:
Title:
The structure of Resuscitation Promoting Factor B from M. tuberculosis reveals unexpected ubiquitin-like domains
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2015-09-30
Release Date:
2015-11-18
Method Details:
Experimental Method:
Resolution:
2.60 Å
R-Value Free:
0.29
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Resuscitation-promoting factor RpfB
Chain IDs:A, B
Chain Length:248
Number of Molecules:2
Biological Source:Mycobacterium tuberculosis
Primary Citation
The structure of Resuscitation promoting factor B from M. tuberculosis reveals unexpected ubiquitin-like domains.
Biochim.Biophys.Acta 1860 445 451 (2015)
PMID: 26549874 DOI: 10.1016/j.bbagen.2015.11.001

Abstact

BACKGROUND RpfB is a key factor in resuscitation from dormancy of Mycobacterium tuberculosis. This protein is a cell-wall glycosidase, which cleaves cell-wall peptidoglycan. RpfB is structurally complex and is composed of three types of domains, including a catalytic, a G5 and three DUF348 domains. Structural information is currently limited to a portion of the protein including only the catalytic and G5 domains. To gain insights into the structure and function of all domains we have undertaken structural investigations on a large protein fragment containing all three types of domains that constitute RpfB (RpfB3D). METHODS The structural features of RpfB3D have been investigated combining x-ray crystallography and biophysical studies. RESULTS AND CONCLUSIONS The crystal structure of RpfB3D provides the first structural characterization of a DUF348 domain and revealed an unexpected structural relationship with ubiquitin. The crystal structure also provides specific structural features of these domains explaining their frequent association with G5 domains. GENERAL SIGNIFICANCE Results provided novel insights into the mechanism of peptidoglycan degradation necessary to the resuscitation of M. tuberculosis. Features of the DUF348 domain add structural data to a large set of proteins embedding this domain. Based on its structural similarity to ubiquitin and frequent association to the G5 domain, we propose to name this domain as G5-linked-Ubiquitin-like domain, UBLG5.

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