Meiosis-specific telomere-associated protein involved in meiotic telomere attachment to the nucleus inner membrane, a crucial step for homologous pairing and synapsis. Component of the MAJIN-TERB1-TERB2 complex, which promotes telomere cap exchange by mediating attachment of telomeric DNA to the inner nuclear membrane and replacement of the protective cap of telomeric chromosomes: in early meiosis, the MAJIN-TERB1-TERB2 complex associates with telomeric DNA and the shelterin/telosome complex. During prophase, the complex matures and promotes release of the shelterin/telosome complex from telomeric DNA. In the MAJIN-TERB1-TERB2 complex, TERB1 probably mediates association with the shelterin/telosome complex via interaction with TERF1, promoting priming telomeric DNA attachment'. Promotes telomere association with the nuclear envelope and deposition of the SUN-KASH/LINC complex. Also recruits cohesin to telomeres to develop structural rigidity. Component of the MAJIN-TERB1-TERB2 complex, composed of MAJIN, TERB1 and TERB2. Interacts with TERF1, STAG3 and SUN1. Interacts (via Myb-like domain) with the cohesin complex; probably mediated via interaction with STAG3. Localizes to telomeres during meiotic prophase. In leptotene spermatocytes, localizes to telomeres that localize to the nucleus inner membrane. Phosphorylated by CDK. Phosphorylation by CDK takes place in late prophase when the cap exchange is prominent. is important for the stabilization of telomere attachment but dispenable for the cap exchange. The disease is caused by variants affecting the gene represented in this entry. Belongs to the TERB1 family.