Protein: Otefin (LEM domain-containing protein Otefin) (P20240)
Organism: Drosophila melanogaster (Fruit fly)
Function: Inner nuclear membrane protein. Involved in the attachment of membrane vesicles to chromatin during nuclear assembly, and is probably required for centrosome maturation and cell cycle progression during mitosis. Essential for differentiation of certain tissues and the maintenance of progenitor cell populations. Required for the differentiation and maintenance of male and female germline stem cells (GSCs), as well as the maintenance of somatic cells in the GSC niche. This role is likely to be independent of the BMP (Dpp) pathway that negatively regulates bam transcription during GSC differentiation. During development, plays essential and redundant functions with the other LEM domain proteins; bocks and MAN1. Also has a redundant but important role with bocks during larval development.
Subcellular location: Nucleus inner membrane {ECO:0000269|PubMed:16439308, ECO:0000269|PubMed:18410727, ECO:0000269|PubMed:22751930, ECO:0000269|PubMed:2517292, ECO:0000269|PubMed:27174470, ECO:0000269|PubMed:8999964, ECO:0000269|PubMed:9199347, ECO:0000269|PubMed:9632815}; Peripheral membrane protein {ECO:0000269|PubMed:2517292, ECO:0000269|PubMed:8999964, ECO:0000269|PubMed:9199347}; Nucleoplasmic side {ECO:0000269|PubMed:2517292}. Nucleus, nucleoplasm {ECO:0000269|PubMed:8999964}. Cytoplasm {ECO:0000269|PubMed:22751930, ECO:0000269|PubMed:9199347}. Chromosome {ECO:0000269|PubMed:22751930, ECO:0000269|PubMed:2517292}. Cytoplasm, cytoskeleton, spindle pole {ECO:0000269|PubMed:16439308, ECO:0000269|PubMed:2186029, ECO:0000269|PubMed:22751930}. Cytoplasm, cytoskeleton, microtubule organizing center, centrosome {ECO:0000269|PubMed:22751930}. Note=Component of the spindle envelope during early mitotic cycles (PubMed:2186029, PubMed:2517292). Following nuclear envelope breakdown, becomes dispersed in the cytoplasm and concentrated at the spindle poles (PubMed:22751930, PubMed:2517292). At anaphase (when the nuclear envelope begins to reassemble), locates to the chromosomes accumulating first in areas adjacent to centrosomes and at the peripheral sites of the chromosomes (PubMed:22751930, PubMed:2517292). At telophase, expressed as a continuous rim around the chromatin and increased expression in the midspindle area (PubMed:22751930). During cytokinesis, locates to the nuclear periphery with some remaining in the cytoplasm and at the mid-body (PubMed:22751930). At stage 4 of egg development, expression in the oocyte nuclear envelope is higher than in the nurse nuclear envelope (PubMed:9199347). Expression in oocyte cytoplasm increases after stages 6 to 7 of egg development (PubMed:9199347). {ECO:0000269|PubMed:2186029, ECO:0000269|PubMed:22751930, ECO:0000269|PubMed:2517292, ECO:0000269|PubMed:9199347}.
Interaction partners:
- Lamin Dm0
- Inner nuclear membrane protein Man1
- Barrier-to-autointegration factor
- Cyclin-dependent kinase 1
- LEM domain-containing protein Bocksbeutel
- Lamin-C
- Cell division cycle 5, isoform A
- Proliferating cell nuclear antigen
- Fascetto
- Lamin-B receptor
Sequence:
MADVDDFDSLSNAELRAKMLAQGLPNIPVTDSSRKVLVKRLRASIGGQASPAASPKKTNRRETLAPAPGAPSAPAAASTPVDKLDGNKVAPATKARRTITAAEAKEPVRRLPEEAIRRRPDEADRLRSEEPVAARKPTTAPAAQPVQTRRTSTSSGSERKVVEPLRKPETIVEQPASSKRADREENYLKVNSLIVLESDEEEDEQLVQAADLVEQEHAARQKTTKLASSGTTTYEYKSKVVEPPRRQVYEATAAPVLPPSVPSARAQTTSSTRSYDYASNPAPGRYSSFVRTAAQGYVTAEAPPVASYSSSYKRTYANELSDDTDSKEDQYESTFARNLARLRAERIGDRISPYSRRTLASGNAGSGSLGYEPRARRSLRPNDNSVSEAFNRWLNSLEQKYHIKSKLFIVLLVLLLIGVYYIFY