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Phylogenetic conservation of a class III major histocompatibility complex antigen, factor B. Isolation and nucleotide sequencing of mouse factor B cDNA clones.
The complement protein factor B is a novel serine protease which is encoded within the major histocompatibility complex in man, guinea pig, and mouse. To determine the structure of mouse factor B, cDNA clones were isolated from mouse strains of two different major histocompatibility complex haplotypes, H-2k and H-2d, and clones of 0.9 and 1.5 kilobases, respectively, were sequenced. The H-2d clone includes the H-2k clone sequence and spans 94% of the Bb-coding sequence. No differences in sequence or in restriction enzyme sites were observed between the H-2k and H-2d clones. The H-2d clone displays 83% nucleotide homology and 83% (derived) amino acid homology with that of human factor B; there are no insertions or deletions. Comparison of the mouse and human factor B sequence reveals extensive regional homology at the catalytic residues and in the NH2-terminal portion of the Bb fragment.
PMID: 6689022 [PubMed - indexed for MEDLINE]
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Cited by 13 PubMed Central articles
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