Identification of the Hemidesmosomal 500 kDa Protein (HD1) as Plectin

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Author(s)

Abstract

HD1 is a 500 kDa hemidesmosomal plaque protein recognized by monoclonal antibody mAb-121. Recent research on inherited skin disease has suggested that it might be identical to plectin or an isoform. To cast light on this question, we have prepared several monoclonal antibodies that recognize a 500 kDa protein in the hemidesmosome fraction. Unexpectedly, some staining pattern heterogeneity was observed on immunofluorescence microscopy. Attention was focused on two monoclonal antibodies which gave different localization in bovine skin and retinal pigment epithelial cells. Determination of the amino-terminal sequence of an antigenic 100 kDa polypeptide fragment derived from the 500 kDa component of an insoluble fraction of bovine hepatocytes revealed it was identical to that of plectin. Using the two antibodies, we screened a cDNA library derived from BMGE+H, a bovine mammary gland epithelial cell line. The isolated cDNA clones corresponded to the rod domain of bovine plectin, with two separate epitope regions for each of the antibodies. From these results we conclude that the hemidesmosomal 500 kDa component HD1 is identical to plectin. As judged on rough estimation of molar ratios on this basis, hemidesmosomes are composed of plectin, BP230, the integrin β4 subunit, and α6 in a 1:1:1:1 ratio.

Journal

  • The Journal of Biochemistry

    The Journal of Biochemistry 126(6), 1144-1150, 1999-12-01

    The Japanese Biochemical Society

References:  38

Codes

  • NII Article ID (NAID)
    10005859815
  • NII NACSIS-CAT ID (NCID)
    AA00694073
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    0021924X
  • NDL Article ID
    4930108
  • NDL Source Classification
    ZR2(科学技術--生物学--生化学)
  • NDL Call No.
    Z53-B472
  • Data Source
    CJP  NDL  J-STAGE 
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