CTAG/Pcc1 family (IPR015419)

Short name: CTAG/Pcc1

Overlapping homologous superfamilies


Family relationships



This entry represents the CTAG/Pcc1 family. Its members include yeast EKC/KEOPS complex subunit Pcc1, mammalian EKC/KEOPS complex subunit Lage3 and human cancer/testis antigen (CTAG) 1/2.

In Saccharomyces cerevisiae, Pcc1 is a component of the EKC/KEOPS protein complex that is required for the formation of a threonylcarbamoyl group on adenosine at position 37 (t6A37) in tRNAs that read codons beginning with adenine [PMID: 16874308].

Similar to its S. cerevisiae homologue, human Lage3 is part of the EKC complex that is essential for a universal tRNA modification. The human EKC complex interacts with tumour antigen PRAME (preferentially expressed antigen in melanoma), and hence involved in oncogenesis [PMID: 22912744].

Human CTAG 1 and 2 (also known as NY-ESO-1 and 2) share protein sequence similarity with Pcc1, however, their function is not clear. They are linked to cancer progression [PMID: 24970819].

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.