title: Identification of MAL2, a novel member of the mal proteolipid family, though interactions with TPD52-like proteins in the yeast two-hybrid system.
abstract: The TPD52 (tumor protein D52)-like proteins are small coiled-coil motif-bearing proteins which were first identified though their expression in human breast carcinoma. TPD52-like proteins are known to interact in hetero-and homomeric fashions, but there are no known heterologous binding partners for these proteins. We now report the cloning of a novel member of the MAL proteolipid family, named MAL2, though its interaction with a TPD52L2 bait in a yeast two-hybrid screen. MAL2 is predicted to be 176 residues (19 kDa) with four transmembrane domains and is 35.8% identical to MAL, a proteolipid required in apical vesicle transport. The MAL2 prey bound all TPD52-like baits tested in the yeast two-hybrid system and in vitro translation of MAL2 produced a single 19-kDa (35)S-labeled protein which specifically bound full-length GST-Tpd52 in GST pull-down assays. The gene MAL2, which was localized to human chromosomal band 8q23 and shown to consist of four exons, is predominantly expressed in human kidney, lung, and liver. Our study has therefore identified a novel member of the MAL proteolipid family and potentially implicates TPD52-like proteins in vesicle transport.
authors.affiliation: Molecular Oncology Laboratory, Oncology Research Unit, The Children's Hospital at Westmead, Locked Bag 4001, Westmead, NSW, 2145, Australia.
authors.forename: S H
authors.initials: SH
authors.lastname: Wilson
authors.forename: A M
authors.initials: AM
authors.lastname: Bailey
authors.forename: C R
authors.initials: CR
authors.lastname: Nourse
authors.forename: M G
authors.initials: MG
authors.lastname: Mattei
authors.forename: J A
authors.initials: JA
authors.lastname: Byrne
mesh_terms: D000595:Amino Acid Sequence; D001943:Breast Neoplasms / Q000737:chemistry; D002352:Carrier Proteins / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D002874:Chromosome Mapping / Q000379:methods; D002898:Chromosomes, Human, Pair 8 / Q000235:genetics; D018076:DNA, Complementary / Q000235:genetics; D005982:Glutathione Transferase / Q000235:genetics / Q000378:metabolism; D006801:Humans; D026901:Membrane Transport Proteins; D008969:Molecular Sequence Data; D009185:Myelin Proteins; D062806:Myelin and Lymphocyte-Associated Proteolipid Proteins; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D011485:Protein Binding / Q000235:genetics; D021381:Protein Transport / Q000235:genetics; D011510:Proteolipids / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D014407:Tumor Cells, Cultured; D020798:Two-Hybrid System Techniques; D033921:Vesicular Transport Proteins
chemical_list: D002352:Carrier Proteins; D018076:DNA, Complementary; C569026:MAL protein, human; C438606:MAL2 protein, human; D026901:Membrane Transport Proteins; D009185:Myelin Proteins; D062806:Myelin and Lymphocyte-Associated Proteolipid Proteins; D009363:Neoplasm Proteins; D011510:Proteolipids; D012333:RNA, Messenger; D011994:Recombinant Proteins; C114751:TPD52 protein, human; C486414:TPD52L2 protein, human; D033921:Vesicular Transport Proteins; D005982:Glutathione Transferase