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Published on: August 1, 2011
Cloning, central nervous system expression and chromosomal mapping of the mouse PAK-1 and PAK-3 genes
P D Burbelo1, C A Kozak, A A Finegold
1Lombardi Cancer Center, Georgetown University Medical Center, Washington, DC 20007, USA. burbelop@medlib.georgetown.edu
Abstract:
Two cDNAs encoding PAK kinases were isolated from a mouse embryo library by screening with a PCR-generated probe derived from the kinase domain of a rat PAK kinase. These cDNAs, designated PAK-1 and PAK-3, encode mouse PAK kinases of 545 and 544 amino acids, respectively. Both proteins possess an N-terminal Cdc42/Rac interacting binding domain (CRIB) and a C-terminal serine/threonine kinase domain. Comparison of the two mouse PAK kinases revealed that the proteins show 87% amino acid identity. Northern analysis of a multiple mouse tissue blot with a PAK-1 probe detected a 3.0kb transcript that was almost exclusively expressed in the brain and spinal cord compared to other tissues such as lung, liver and kidney. A similar pattern of central nervous system tissue expression of PAK-3 transcripts of 3.6 and 8kb was also observed. Analysis of two multilocus genetic crosses localized Pak1 and Pak3 to a position on chromosome 7 and X, respectively. The high level of PAK-1 and PAK-3 kinase expression in the mouse brain and spinal cord suggests a potentially important role for these kinases in the control of the cellular architecture and/or signaling in the central nervous system.
Insights
Researchers identified two mouse PAK kinases, PAK-1 and PAK-3, crucial for brain and spinal cord function. Their high expression suggests a key role in central nervous system cellular structure and signaling pathways.
Area of Science:
- Molecular Biology
- Neuroscience
- Genetics
Background:
- p21-activated kinases (PAKs) are serine/threonine kinases involved in regulating the actin cytoskeleton.
- PAK kinases are activated by Rho GTPases like Cdc42 and Rac.
- Their specific roles in the central nervous system (CNS) are not fully elucidated.
Purpose of the Study:
- To isolate and characterize novel mouse PAK kinases.
- To investigate the expression patterns and chromosomal localization of these kinases.
- To infer their potential functions in the CNS.
Main Methods:
- Screening a mouse embryo cDNA library using a PCR-generated probe.
- Sequence analysis of isolated cDNAs to determine protein structure.
- Northern blot analysis to assess tissue-specific gene expression.
- Genetic mapping using multilocus crosses to determine chromosomal locations.
Main Results:
- Two cDNAs, PAK-1 and PAK-3, were isolated, encoding 545 and 544 amino acid proteins, respectively.
- Both proteins contain a Cdc42/Rac interacting binding (CRIB) domain and a kinase domain, with 87% amino acid identity.
- PAK-1 transcripts were predominantly found in the brain and spinal cord.
- PAK-3 transcripts showed similar CNS-specific expression patterns.
- Pak1 and Pak3 genes were mapped to mouse chromosomes 7 and X, respectively.
Conclusions:
- PAK-1 and PAK-3 are novel mouse PAK kinases with distinct expression profiles.
- High expression in the brain and spinal cord suggests critical roles in CNS development and function.
- These kinases may be involved in regulating cellular architecture and signaling within the central nervous system.
