title: Interactions of HSP22 (HSPB8) with HSP20, alphaB-crystallin, and HSPB3.
abstract: Seven of the 10 mammalian small heat shock proteins (sHSP) are expressed in muscle where they constitute 3% or more of total protein. sHSPs interact with one another, and these interactions are believed to be important for their functions. In cell types expressing multiple sHSPs, it is of interest to know which sHSPs interact with one another. We have previously shown that HSP22 interacts with itself as well as with HSP27, MKBP, and cvHSP. Using yeast two-hybrid assays and Förster resonance energy transfer microscopy, we now show that HSP22 also can interact with two additional members of the sHSP family, alphaB-crystallin and HSP20. We also show that HSP22 is found in HPLC fractions of primate cardiac muscle containing high molecular weight complexes that include alphaB-crystallin and HSP20. Our results suggest that a variety of oligomers composed of different proportions of different sHSPs may form in cell types expressing multiple sHSPs.
authors.affiliation: Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Fontaine
authors.forename: Xiankui
authors.initials: X
authors.lastname: Sun
authors.forename: Rainer
authors.initials: R
authors.lastname: Benndorf
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Welsh
mesh_terms: D001665:Binding Sites; D050886:HSP20 Heat-Shock Proteins / Q000378:metabolism*; D006360:Heat-Shock Proteins / Q000378:metabolism*; D006801:Humans; D018832:Molecular Chaperones; D011485:Protein Binding; D025941:Protein Interaction Mapping; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism*; D038203:alpha-Crystallin B Chain / Q000378:metabolism*
chemical_list: D050886:HSP20 Heat-Shock Proteins; C116424:HSPB3 protein, human; C494382:HSPB6 protein, human; C413214:HSPB8 protein, human; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones; D029701:Saccharomyces cerevisiae Proteins; D038203:alpha-Crystallin B Chain; D017346:Protein Serine-Threonine Kinases