title: Association of the leukocyte plasma membrane with the actin cytoskeleton through coiled coil-mediated trimeric coronin 1 molecules.
abstract: Coronin 1 is a member of the coronin protein family specifically expressed in leukocytes and accumulates at sites of rearrangements of the F-actin cytoskeleton. Here, we describe that coronin 1 molecules are coiled coil-mediated homotrimeric complexes, which associate with the plasma membrane and with the cytoskeleton via two distinct domains. Association with the cytoskeleton was mediated by trimerization of a stretch of positively charged residues within a linker region between the N-terminal, WD repeat-containing domain and the C-terminal coiled coil. In contrast, neither the coiled coil nor the positively charged residues within the linker domain were required for plasma membrane binding, suggesting that the N-terminal, WD repeat-containing domain mediates membrane interaction. The capacity of coronin 1 to link the leukocyte cytoskeleton to the plasma membrane may serve to integrate outside-inside signaling with modulation of the cytoskeleton.
authors.affiliation: Biozentrum, University of Basel, CH 4056 Basel, Switzerland.
authors.forename: John
authors.initials: J
authors.lastname: Gatfield
authors.forename: Imke
authors.initials: I
authors.lastname: Albrecht
authors.forename: Bettina
authors.initials: B
authors.lastname: Zanolari
authors.forename: Michel O
authors.initials: MO
authors.lastname: Steinmetz
authors.forename: Jean
authors.initials: J
authors.lastname: Pieters
mesh_terms: D000199:Actins / Q000378:metabolism*; D000595:Amino Acid Sequence; D000818:Animals; D002460:Cell Line; D002462:Cell Membrane / Q000378:metabolism*; D002942:Circular Dichroism; D003599:Cytoskeleton / Q000378:metabolism*; D015180:Electrophoresis, Gel, Two-Dimensional; D006801:Humans; D007150:Immunohistochemistry; D007438:Introns; D019169:Jurkat Cells; D007962:Leukocytes / Q000166:cytology*; D008264:Macrophages / Q000166:cytology; D051379:Mice; D008840:Microfilament Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism* / Q000648:ultrastructure; D008954:Models, Biological; D008969:Molecular Sequence Data; D020033:Protein Isoforms / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D020539:Sequence Analysis, Protein; D017386:Sequence Homology, Amino Acid; D013056:Spectrophotometry, Ultraviolet; D013347:Subcellular Fractions / Q000378:metabolism
chemical_list: D000199:Actins; D008840:Microfilament Proteins; D020033:Protein Isoforms; C072061:coronin proteins