2J8I image
Entry Detail
PDB ID:
2J8I
Keywords:
TOXIN
Title:
Structure of NP275, a pentapeptide repeat protein from Nostoc punctiforme
Biological Source:
Source Organism:
NOSTOC PUNCTIFORME
Host Organism:
ESCHERICHIA COLI
PDB Version:
Deposition Date:
2006-10-25
Release Date:
2006-12-07
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.10 Å
R-Value Free:
0.25
R-Value Work:
0.18
R-Value Observed:
0.19
Space Group:
P 21 21 21
2J8I validation report
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:NP275
Chain IDs:A, B
Chain Length:118
Number of Molecules:2
Biological Source:NOSTOC PUNCTIFORME
Ligand Molecules
CL
Primary Citation
Structural Characterization of the Fusion of Two Pentapeptide Repeat Proteins, Np275 and Np276, from Nostoc Punctiforme: Resurrection of an Ancestral Protein.
Protein Sci. 16 755 ? (2007)
PMID: 17384236 DOI: 10.1110/PS.062637707

Abstact

The Nostoc punctiforme genes Np275 and Np276 are two adjacently encoded proteins of 98 and 75 amino acids in length and exhibit sequences composed of tandem pentapeptide repeats. The structures of Np275 and a fusion of Np275 and Np276 were determined to 2.1 and 1.5 A, respectively. The two Nostoc proteins fold as highly symmetric right-handed quadrilateral beta-helices similar to the mycobacterial protein MfpA implicated in fluoroquinolone resistance and DNA gyrase inhibition. The sequence composition of the intervening coding region and the ability to express a fused protein by removing the stop codon for Np275 suggests Np275 and Np276 were recently part of a larger ancestral pentapeptide repeat protein.

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Primary Citation of related structures
2J8K