5E27: The Structure Of Resuscitation Promoting Factor B From M. Tuberculosis Reveals Unexpected Ubiquitin-like Domains

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.
PDB ID: 5E27Download
MMDB ID: 134310
PDB Deposition Date: 2015/9/30
Updated in MMDB: 2015/12
Experimental Method:
x-ray diffraction
Resolution: 2.6  Å
Source Organism:
Similar Structures:
Biological Unit for 5E27: monomeric; determined by author and by software (PISA)
Molecular Components in 5E27
Label Count Molecule
Protein (1 molecule)
Resuscitation-promoting Factor Rpfb
Molecule annotation
* Click molecule labels to explore molecular sequence information.

Citing MMDB