May form homodimers and heterodimers with TMCC2 or TMCC3 via the coiled-coil domains (PubMed:24454821). Interacts with ribosomal proteins RPL4 and RPS6 (PubMed:24454821). Concentrates in discrete patches along peripheral endoplasmic reticulum tubules. Widely expressed, with highest levels in brain, spinal cord and testis. Belongs to the TEX28 family.