Abstract:
:Type A receptors of gamma-aminobutyric acid (GABA), an inhibitory neurotransmitter, contain alpha, beta, delta, gamma, and rho subunits. The gamma subunit has four subtypes: gamma1, gamma2, gamma3, andgamma4. GABA(A) receptor-associated protein (GABARAP) was previously demonstrated to act as a linker protein between microtubules and the gamma2 subunit of GABA(A) receptors. However, no other linker proteins have been identified as mediating the linkage of microtubules and the remaining subunits of GABA(A) receptors. In this study we identified three human paralogues (GABARAPL1, GABARAPL2, and GABARAPL3) and two mouse orthologues (Gabarapl1 and Gabarapl2) of human GABARAP, all of which encoded 117 amino acids, as does Gabarapl. The expression patterns of GABARAPL1, GABARAPL2, and GABARAP in 16 adult tissues showed that they were expressed ubiquitously. The expression levels of GABARAPL1 as a 2.3-kb transcript were very high in brain, heart, peripheral blood leukocytes, liver, kidney, placenta, and skeletal muscle, very low in thymus and small intestine, and moderate in other tissues tested. The unique 1.35-kb transcript of GABARAPL2 was expressed at high levels in heart, brain, testis, prostate, ovary, spleen, and skeletal muscle, at very low levels in lung, thymus, and small intestine, and moderately in other tissues tested. For GABARAP, a 1.3-kb transcript was abundantly expressed in all tested tissues with small variation. The expression patterns of Gabarapl1 and Gabarapl2 were similar to those of their counterparts in human. In addition, GABARAPL1 was localized to human chromosome 12p12.3 and GABARAPL2 to 16q22.3-q24.1 by RH mapping, while GABARAP and GABARAPL3 were found to be localized at chromosomes 17p13.2 and 15q25.1, respectively, by searching the related databases. Sequence comparison of the cDNAs and their corresponding genomic sequences shows that GABARAP, GABARAPL1, and GABARAPL2 are composed of four exons each, while GABARAPL3 is distributed only at one exon.
journal_name
Genomicsjournal_title
Genomicsauthors
Xin Y,Yu L,Chen Z,Zheng L,Fu Q,Jiang J,Zhang P,Gong R,Zhao Sdoi
10.1006/geno.2001.6555subject
Has Abstractpub_date
2001-06-15 00:00:00pages
408-13issue
3eissn
0888-7543issn
1089-8646pii
S0888-7543(01)96555-3journal_volume
74pub_type
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