title: CYP1A-immunopositive proteins in bivalves identified as cytoskeletal and major vault proteins.
abstract: To identify possible CYP1A-immunopositive proteins in bivalves, we used anti-fish CYP1A antibodies combined with one- and two-dimensional gel electrophoresis and mass spectrometry, and found that two of the main CYP1A-immunopositive proteins in digestive gland of Mytilus edulis, were cytoskeletal actin (42 kDa) and major vault protein (102 kDa), while the main CYP1A-immunopositive protein in the clam Chamaelea gallina was the cytoskeletal protein tropomyosin (33 kDa). Anti-CYP1A cross-reactive bands of 48-54 and 75 kDa in M. edulis were observed but not identified in this study. Sequence alignments with one of the most conserved CYP1A regions (NIRDITDSLIDHCED) from fish revealed similarities with tropomyosin and actin sequences from mussels, which could explain the immunological cross-reactivity. Changes in isoforms of tropomyosin after exposure to Aroclor1254 and Cu(II), could indicate modifications due to oxidative stress. Effects of pollutant related oxidative stress on the cytoskeleton require further studies.
authors.affiliation: Department of Molecular Biology, University of Bergen, P.O. Box 7800, N-5020 Bergen, Norway. bjorn.grosvik@mbi.uib.no
authors.forename: Bjørn Einar
authors.initials: BE
authors.lastname: Grøsvik
authors.forename: Henrik
authors.initials: H
authors.lastname: Jonsson
authors.forename: Manuel J
authors.initials: MJ
authors.lastname: Rodríguez-Ortega
authors.forename: Peter
authors.initials: P
authors.lastname: Roepstorff
authors.forename: Anders
authors.initials: A
authors.lastname: Goksøyr
mesh_terms: D000199:Actins / Q000302:isolation & purification* / Q000378:metabolism; D000818:Animals; D000906:Antibodies / Q000276:immunology; D049872:Bivalvia / Q000235:genetics / Q000502:physiology*; D015153:Blotting, Western; D020111:Chlorodiphenyl (54% Chlorine) / Q000494:pharmacology; D003300:Copper / Q000494:pharmacology; D003429:Cross Reactions; D019363:Cytochrome P-450 CYP1A1 / Q000276:immunology* / Q000378:metabolism; D008861:Microsomes / Q000276:immunology; D049880:Mytilus edulis / Q000235:genetics / Q000502:physiology; D010471:Perches / Q000502:physiology; D016415:Sequence Alignment; D014335:Tropomyosin / Q000187:drug effects / Q000235:genetics; D020394:Vault Ribonucleoprotein Particles / Q000302:isolation & purification* / Q000378:metabolism; D000099187:Major Vault Protein
chemical_list: D000199:Actins; D000906:Antibodies; D020111:Chlorodiphenyl (54% Chlorine); D003300:Copper; D019363:Cytochrome P-450 CYP1A1; D014335:Tropomyosin; D020394:Vault Ribonucleoprotein Particles; D000099187:Major Vault Protein