Isolation and characterization of cDNA clones for Humly9: the human homologue of mouse Ly9.
Ly9 is a mouse cell membrane antigen found on all lymphocytes and coded for by a gene that maps to chromosome 1. We previously described the isolation and characterization of a full-length cDNA clone for mouse Ly9. Using cross-species hybridization we isolated cDNA clones encoding the human homologue Humly9. Analysis of the predicted protein sequence suggests that the extra-cellular portion of the Humly9 molecules is composed of four Ig-like domains: a V domain (V) without disulphide bonds and a truncated C2 domain (tC2) with two disulphide bonds, a second V domain without disulphide bonds and a second tC2 with two disulphide bonds, i.e., as V-tC2-V-tC2. The gene encoding Humly9 was mapped to chromosome 1 by analysis of human/hamster hybrids, and more specifically to the 1q22 region by in situ hybridization. The protein sequence data support the view that Humly9 belongs to the immunoglobulin-superfamily subgroup which includes CD48, CD2, and LFA-3.
Sandrin
M S
MS
Molecular Immunogenetics Laboratory, Austin Research Institute, Austin Hospital, Heidelberg, Vic, Australia.
Henning
M M
MM
Lo
M F
MF
Baker
E
E
Sutherland
G R
GR
McKenzie
I F
IF
D000595:Amino Acid Sequence; D000818:Animals; D000950:Antigens, Ly / Q000235:genetics*; D001483:Base Sequence; D002874:Chromosome Mapping; D002878:Chromosomes, Human, Pair 1; D006224:Cricetinae; D018076:DNA, Complementary / Q000235:genetics; D015723:Gene Library; D005796:Genes; D006801:Humans; D006822:Hybrid Cells; D017404:In Situ Hybridization, Fluorescence; D051379:Mice; D008969:Molecular Sequence Data; D005810:Multigene Family; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity
D000950:Antigens, Ly; D018076:DNA, Complementary