Abstract:
:Nonaspanins constitute a family of proteins, also called TM9SF, characterized by a large non-cytoplasmic domain and nine putative transmembrane domains. This family is highly conserved through evolution and comprises three members in Saccharomyces cerevisiae, Dictyostelium discoideum, and Drosophila melanogaster, and four members are reported in mammals (TM9SF1-TM9SF4). Genetic studies in Dictyostelium and Drosophila have shown that TM9SF members are required for adhesion and phagocytosis in innate immune response, furthermore, human TM9SF1 plays a role in the regulation of autophagy and human TM9SF4 in tumor cannibalism. Here we report that the zebrafish genome encodes five members of this family, TM9SF1-TM9SF5, which show high level of sequence conservation with the previously reported members. Expression analysis in zebrafish showed that all members are maternally expressed and continue to be present throughout embryogenesis to adults. Gene expression could not be regulated by pathogen-associated molecular patterns such as LPS, CpG, or Poly I:C. By bioinformatic analyses of 80 TM9SF protein sequences from yeast, plants, and animals, we confirmed a very conserved protein structure. An evolutionary conserved immunoreceptor tyrosine-based inhibition motif has been detected in the cytoplasmic domain between transmembrane domain (TM) 7 and TM8 in TM9SF1, TM9SF2, TM9SF4 and TM9SF5, and at the extreme C-terminal end of TM9SF4. Finally, a conserved TRAF2 binding domain could also be predicted in the cytoplasmic regions of TM9SF2, TM9SF3, TM9SF4, and TM9SF5. This confirms the hypothesis that TM9SF proteins may play a regulatory role in a specific and ancient cellular mechanism that is involved in innate immunity.
journal_name
Immunogeneticsjournal_title
Immunogeneticsauthors
Pruvot B,Laurens V,Salvadori F,Solary E,Pichon L,Chluba Jdoi
10.1007/s00251-010-0472-xsubject
Has Abstractpub_date
2010-10-01 00:00:00pages
681-99issue
10eissn
0093-7711issn
1432-1211journal_volume
62pub_type
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