Table 1. Identified interacting partners of C1ORF123 and its homologues from the STRING database (version 9.1).

No.	Protein	Description	Experimental evidence	Reference
1	RHBDL1	Rhomboid, veinlet-like 1	Two-hybrid pooling assay	Giot et al. (2003 ▸)
2	TMBIM6	Transmembrane BAX inhibitor motif-containing protein 6; suppressor of apoptosis	Two-hybrid pooling assay	Giot et al. (2003 ▸)
3	CDKN1A	Cyclin-dependent kinase inhibitor 1A; cell-cycle regulator	Two-hybrid pooling assay	Stelzl et al. (2005 ▸)
4	SRP14	Signal recognition particle 14 kDa	Tandem affinity assay	Krogan et al. (2006 ▸)
5	SRP19	Signal recognition particle 19 kDa	Tandem affinity assay	Krogan et al. (2006 ▸)
6	NPUK68	UKp68-like protein; binds polyadenosine RNA oligonucleotides	Affinity capture-RNA assay	Batisse et al. (2009 ▸)
7	ZC3H14	Zinc-finger CCCH domain-containing protein 14; binds polyadenosine RNA oligonucleotides	Affinity capture-RNA assay	Batisse et al. (2009 ▸)
8	ANXA1	Annexin 1; calcium/phospholipid-binding protein which promotes membrane fusion and is involved in exocytosis; also regulates phospholipase A2 activity	Two-hybrid assay	Vinayagam et al. (2011 ▸)
9	UBB	Ubiquitin B; protein degradation, maintenance of chromatin structure, regulation of gene expression, stress response, ribosome biogenesis and DNA repair	Affinity capture-MS assay	Danielsen et al. (2011 ▸)
1.	UBC	Ubiquitin C; protein degradation, maintenance of chromatin structure, regulation of gene expression, stress response, ribosome biogenesis and DNA repair	Affinity capture-MS assay	Danielsen et al. (2011 ▸)
11	LARP1 and LARP1B	La ribonucleoprotein domain family	Affinity capture-RNA assay	Schenk et al. (2012 ▸)
12	SSB	Sjögren syndrome antigen B (autoantigen La); binds to the 3′ poly(U) termini of nascent RNA polymerase III transcripts	Affinity capture-RNA assay	Schenk et al. (2012 ▸)