title: Cloning, genomic organization and chromosomal assignment of the mouse p190-B gene.
abstract: The p190 family of GTPases consists of at least two different isoforms both containing an N-terminal GTPase and a C-terminal Rho GAP domain. Here we have isolated and characterized genomic and cDNA clones spanning the entire coding region of the mouse p190-B gene. Genomic data were obtained by sequencing plasmid subclones of two overlapping mouse genomic phage clones. Interestingly, a single 3.9 kb exon was found to contain approx. 80% of the coding region of the mouse p190-B protein (amino acid residues 1-1238) including the 5'-untranslated region, the N-terminal GTPase domain and a middle domain of unknown function. Missing from this exon, however, was the C-terminal Rho GAP domain, which was cloned from mouse brain mRNA using reverse transcriptase polymerase chain reaction. Comparison of the mouse with the human p190-B proteins revealed that approx. 97% of the amino acid residues were identical. Northern analysis of total RNA from a variety of mouse tissues detected ubiquitous expression of two p190-B transcripts of 4.0 and 6.8 kb in size. Analysis of two multilocus genetic crosses localized the mouse gene, Gfi2, to a position on chromosome 12, consistent with the mapping of the human gene to a position of conserved synteny on chromosome 14. The high level of sequence homology between the human and the mouse suggests that there is a strong selective pressure to maintain the p190-B protein structure.
authors.affiliation: Lombardi Cancer Center, Georgetown University Medical Center, Washington, DC 20007, USA.burbelop@medlib.georgetown.edu
authors.forename: P D
authors.initials: PD
authors.lastname: Burbelo
authors.forename: A A
authors.initials: AA
authors.lastname: Finegold
authors.forename: C A
authors.initials: CA
authors.lastname: Kozak
authors.forename: Y
authors.initials: Y
authors.lastname: Yamada
authors.forename: H
authors.initials: H
authors.lastname: Takami
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000737:chemistry; D004268:DNA-Binding Proteins; D005091:Exons; D020558:GTP Phosphohydrolases / Q000737:chemistry / Q000235:genetics*; D020690:GTPase-Activating Proteins; D020662:Guanine Nucleotide Exchange Factors; D051379:Mice; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000737:chemistry / Q000235:genetics*; D010750:Phosphoproteins / Q000737:chemistry / Q000235:genetics*; D012097:Repressor Proteins
chemical_list: C513041:Arhgap35 protein, mouse; C513042:Arhgap5 protein, mouse; D018076:DNA, Complementary; D004268:DNA-Binding Proteins; D020690:GTPase-Activating Proteins; D020662:Guanine Nucleotide Exchange Factors; D009687:Nuclear Proteins; D010750:Phosphoproteins; D012097:Repressor Proteins; D020558:GTP Phosphohydrolases