Article (Scientific journals)
Vacuolar system-associated protein-60: a protein characterized from bovine granulosa and luteal cells that is associated with intracellular vesicles and related to human 80K-H and murine beta-glucosidase II.
Brûlé, Sophie; Rabahi, Flora; Faure, Robert et al.
2000In Biology of Reproduction, 62 (3), p. 642 - 654
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Keywords :
Calcium-Binding Proteins; DNA, Complementary; Intracellular Signaling Peptides and Proteins; Membrane Proteins; Phosphoproteins; Prkcsh protein, mouse; Prkcsh protein, rat; Recombinant Proteins; VASAP-60 protein, Bos taurus; Myristoylated Alanine-Rich C Kinase Substrate; Glucosidases; PRKCSH protein, human; beta-Glucosidase; Amino Acid Sequence; Animals; Antibody Specificity; Base Sequence; Cattle; Corpus Luteum/metabolism; Female; Gene Expression Regulation; Glycosylation; Granulosa Cells/metabolism; Humans; Intracellular Membranes/metabolism; Membrane Proteins/genetics; Membrane Proteins/immunology; Membrane Proteins/metabolism; Mice; Molecular Sequence Data; Phosphoproteins/metabolism; Rats; Recombinant Proteins/genetics; Recombinant Proteins/metabolism; Sequence Analysis, DNA; Sequence Homology, Amino Acid; Vacuoles/metabolism; beta-Glucosidase/metabolism; Reproductive Medicine; Cell Biology; General Medicine
Abstract :
[en] It has been suggested that proteins of molecular size 56-58 kDa play an important role in bovine ovarian follicular development and oocyte maturation. A polyclonal antibody was raised against a 56- to 58-kDa protein band purified from bovine granulosa cells and was used to screen granulosa or luteal cell cDNA expression libraries. This work resulted in the identification of a cDNA encoding for a protein of 60.1 kDa with a signal peptide of 13 residues. The bovine 60.1-kDa protein shared an overall 86.7% and 81.8% identity with, respectively, the human 80K-H protein and the mouse putative beta subunit of glucosidase II (beta-GII), and was named vacuolar system-associated protein-60 (VASAP-60). Marked differences in sequence identity were noted in a putative molecular adapter domain containing a tandem D and E amino acid stretch flanked by proline-rich sequences presenting the minimal PXXP SH3 motif. VASAP-60 was shown to be unglycosylated using endoglycosidase H treatment and was found mainly in a cellular membrane fraction of bovine corpus luteum. VASAP-60 was localized in a rat hepatic Golgi/endosome fraction and in wheat germ agglutinin (WGA) affinity chromatographic eluates, thereby suggesting the presence of interactions with membrane glycoproteins. A polyclonal antibody was raised against the putative adapter domain of the recombinant VASAP-60; this was shown to recognize a major 88-kDa and two minor 58-kDa and 50-kDa proteins, suggesting that the major 88-kDa protein band represents the complete VASAP-60 protein whereas the 58-kDa and the 50-kDa bands represent its proteolytic fragments. Northern blot analysis demonstrated the presence of a single 2.3-kilobase transcript in all the bovine tissues analyzed with variation in the steady state level between tissues. Immunohistochemical observations showed that VASAP-60 was widely distributed in bovine tissues and was localized in pericytoplasmic and perinuclear membranes. In epithelial cells, the staining presented a basolateral or apical polarity associated with intracellular vacuoles. In conclusion, we have characterized a novel acidic membrane protein, associated with organelles of the vacuolar system, that is widely and histospecifically expressed in bovine tissues. VASAP-60 represents either the bovine ortholog or a new family member of the previously characterized human 80K-H and murine beta-GII proteins. Our results suggest that VASAP-60 presents characteristics of a molecular adaptor protein with functions in membrane-trafficking events.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Brûlé, Sophie;  Centre de recherche en reproduction animale, Faculté de médecine vétérinaire, Université de Montréal, St-Hyacinthe, Québec, Canada J2S 7C6
Rabahi, Flora;  Ctr. de Rech. en Repro. Animale, Fac. de Med. Veterinaire, Université de Montréal, St-Hyacinthe, Que. J2S 7C6, Canada
Faure, Robert;  U. de Rech. en Pediat., Centre Hospitalier Universitaire, Université Laval, Ste-Foy, Que. G1V 4G2, Canada
Beckers, Jean-François  ;  Université de Liège - ULiège > Département des sciences fonctionnelles (DSF) > Physiologie de la reproduction
Silversides, David W.;  Ctr. de Rech. en Repro. Animale, Fac. de Med. Veterinaire, Université de Montréal, St-Hyacinthe, Que. J2S 7C6, Canada
Lussier, Jacques G.;  Ctr. de Rech. en Repro. Animale, Fac. de Med. Veterinaire, Université de Montréal, St-Hyacinthe, Que. J2S 7C6, Canada ; Ctr. de Rech. en Repro. Animale, Fac. de Med. Veterinaire, Université de Montréal, St-Hyacinthe, Que. J2S 7C6, Canada
Language :
English
Title :
Vacuolar system-associated protein-60: a protein characterized from bovine granulosa and luteal cells that is associated with intracellular vesicles and related to human 80K-H and murine beta-glucosidase II.
Publication date :
March 2000
Journal title :
Biology of Reproduction
ISSN :
0006-3363
eISSN :
1529-7268
Publisher :
Society for the Study of Reproduction, United States
Volume :
62
Issue :
3
Pages :
642 - 654
Peer reviewed :
Peer Reviewed verified by ORBi
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