Identification of New Potential Interaction Partners for Human Cytoplasmic Copper Chaperone Atox1: Roles in Gene Regulation?
Journal article, 2015
The human copper (Cu) chaperone Atox1 delivers Cu to P1B type ATPases in the Golgi network, for incorporation into essential Cu-dependent enzymes. Atox1 homologs are found in most organisms; it is a 68-residue ferredoxin-fold protein that binds Cu in a conserved surface-exposed Cys-X-X-Cys (CXXC) motif. In addition to its well-documented cytoplasmic chaperone function, in 2008 Atox1 was suggested to have functionality in the nucleus. To identify new interactions partners of Atox1, we performed a yeast two-hybrid screen with a large human placenta library of cDNA fragments using Atox1 as bait. Among 98 million fragments investigated, 25 proteins were found to be confident interaction partners. Nine of these were uncharacterized proteins, and the remaining 16 proteins were analyzed by bioinformatics with respect to cell localization, tissue distribution, function, sequence motifs, three-dimensional structures and interaction networks. Several of the hits were eukaryotic-specific proteins interacting with DNA or RNA implying that Atox1 may act as a modulator of gene regulation. Notably, because many of the identified proteins contain CXXC motifs, similarly to the Cu transport reactions, interactions between these and Atox1 may be mediated by Cu.
Models
Computational Biology
Humans
Databases
Gene Expression Regulation
metabolism
Two-Hybrid System Techniques
Molecular
Tertiary
Metallochaperones
chemistry
chemistry
Molecular Chaperones
metabolism
Copper
Protein Interaction Mapping
Protein Structure
Cytoplasm
metabolism
Protein Binding
Protein
metabolism
Author
Helena Öhrvik
Uppsala University
Pernilla Wittung Stafshede
Umeå University
International Journal of Molecular Sciences
16616596 (ISSN) 14220067 (eISSN)
Vol. 16 8 16728-39Subject Categories
Biological Systematics
Cell Biology
Biological Sciences
Biophysics
DOI
10.3390/ijms160816728
PubMed
26213915