Isolation and sequencing of a cDNA clone encoding lysosomal membrane glycoprotein mouse LAMP-1. Sequence similarity to proteins bearing onco-differentiation antigens.

Abstract

We have isolated and sequenced a cDNA clone encoding the mouse LAMP-1 (mLAMP-1) major lysosomal membrane glycoprotein. The deduced protein sequence, which included the NH2-terminal portion of the mLAMP-1 molecule, consisted of 382 amino acids (Mr 41,509). The predicted structure of this protein included an NH2-terminal intralumenal domain consisting of two homology units of approximately 160 residues each separated by a proline-rich hinge region. Each homology unit contained four cysteine residues with two intercysteine intervals of 36-38 residues and one of 68 or 76 residues. The molecule also contained 20 asparagine-linked glycosylation sites within residues 1-287, a membrane-spanning region from residues 347 to 370, and a carboxyl-terminal cytoplasmic domain of 12 residues. The biochemical properties and amino acid sequence of mLAMP-1 were highly similar to those of two other molecules that have been studied as cell surface onco-differentiation antigens: a highly sialylated polylactosaminoglycan-containing glycoprotein isolated from human chronic myelogenous leukemia cells (Viitala, J., Carlsson, S. R., Siebert, P. D., and Fukuda, M. (1988) Proc. Natl. Acad. Sci. U.S.A. 85, in press) and the mouse gp130 (P2B) glycoprotein, in which an increase in beta 1-6 branching of asparagine-linked oligosaccharides has been correlated with metastatic potential in certain tumor cells (Dennis, J.W., Laferte, S., Waghorne, C., Breitman, M.L., and Kerbel, R.S. (1987) Science 236, 582-585).

• Authors: J W Chen, Y Cha, K U Yuksel, R W Gracy, J T August
• Journal: The Journal of biological chemistry (J Biol Chem) Vol. 263 Issue 18 Pg. 8754-8 (Jun 25 1988) ISSN: 0021-9258 [Print] United States
• PMID: 3379044 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S., Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Antigens, CD
• Antigens, Differentiation
• LAMP1 protein, human
• Lamp1 protein, mouse
• Lysosomal-Associated Membrane Protein 1
• Lysosome-Associated Membrane Glycoproteins
• Membrane Glycoproteins
• DNA

Topics

• Amino Acid Sequence
• Animals
• Antigens, CD
• Antigens, Differentiation (genetics)
• Base Sequence
• Cell Line
• Cells, Cultured
• DNA (genetics, isolation & purification)
• Genes
• Humans
• Leukemia
• Lysosomal-Associated Membrane Protein 1
• Lysosome-Associated Membrane Glycoproteins
• Lysosomes (metabolism)
• Membrane Glycoproteins (genetics)
• Mice
• Molecular Sequence Data
• Oncogenes
• Sequence Homology, Nucleic Acid