The tail domain is essential but the head domain dispensable for C. elegans intermediate filament IFA-2 function.
The intermediate filament protein IFA-2 is essential for the structural integrity of the Caenorhabditis elegans epidermis. It is one of the major components of the fibrous organelle, an epidermal structure comprised of apical and basal hemidesmosomes linked by cytoplasmic intermediate filaments that serve to transmit force from the muscle to the cuticle. Mutations of IFA-2 result in epidermal fragility and separation of the apical and basal epidermal surfaces during postembryonic growth. An IFA-2 lacking the head domain fully rescues the IFA-2 null mutant, whereas an IFA-2 lacking the tail domain cannot. Conversely, an isolated IFA-2 head was able to localize to fibrous organelles whereas the tail was not. Taken together these results suggest that the head domain contains redundant signals for IF localization, whereas non-redundant essential functions map to the IFA-2, tail, although the tail is unlikely to be directly involved in fibrous organelle localization.
Department of Biological Sciences, The University of Toledo, Toledo, Ohio, United States of America.
Kyle
K
Williams
Department of Biological Sciences, The University of Toledo, Toledo, Ohio, United States of America.
Kristen
K
Williams
Department of Biological Sciences, The University of Toledo, Toledo, Ohio, United States of America.
Hallie M
HM
Baucher
Department of Biological Sciences, The University of Toledo, Toledo, Ohio, United States of America.
John
J
Plenefisch
D000818:Animals; D017173:Caenorhabditis elegans / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D029742:Caenorhabditis elegans Proteins / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D007381:Intermediate Filament Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D007382:Intermediate Filaments / Q000378:metabolism; D009154:Mutation; D015388:Organelles / Q000378:metabolism; D017434:Protein Structure, Tertiary
D029742:Caenorhabditis elegans Proteins; D007381:Intermediate Filament Proteins; C000604213:Mua-6 protein, C elegans