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Structural, immunocytochemical and initial biochemical characterization of NAOH-extracted gap junctions from an insect, Heliothis virescens

Cell & Tissue Research, ISSN: 0302-766X, Vol: 274, Issue: 2, Page: 393-403
1993
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  • Citations
    9
    • Citation Indexes
      9

Article Description

Subcellular fractions enriched in gap junctions with an ultrastructure similar to those in intact insect tissue have been obtained by extracting crude membranes from the tobacco budworm Heliothis virescens (Lepidoptera: Noctuidae) with 2.5 mM NaOH. n-Octyl-β-d-glucopyranoside (OG) was used to further purify integral membrane proteins in the NaOH-extracted fractions. A polyclonal antibody (R16) is described that specifically labels nonextracted and NaOH-extracted gap junctions in cell fractions by electron microscope immunocytochemistry. R16 immunostaining of sectioned Heliothis testis at the light-microscope level yields a pattern of immunoreactivity consistent with the distribution of gap junctions in the tissue. R16 identifies a 40-kDa protein as a candidate gap junction protein on immunoblots of crude membrane, NaOH-extracted and NaOH/OG-extracted fractions. © 1993 Springer-Verlag.

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