| Autor: |
M Nagashima, G Morris, G Howlett, N Fidge, G Schreiber |
| Jazyk: |
angličtina |
| Rok vydání: |
1988 |
| Předmět: |
|
| Zdroj: |
Journal of Lipid Research, Vol 27, Iss 7, Pp 706-712 (1988) |
| Druh dokumentu: |
article |
| ISSN: |
0022-2275 |
| DOI: |
10.1016/S0022-2275(20)38792-7 |
| Popis: |
A rat apolipoprotein A-II cDNA clone was isolated from a rat liver cDNA library by in situ hybridization of bacteriophage plaques using a 32P-labeled human apoA-II cDNA as a probe. The cDNA insert from this clone was characterized by DNA sequencing. The amino acid composition derived from the DNA sequence data matched well with that of rat apoA-II reported earlier (Herbert et al. 1974. J. Biol Chem. 249: 5718-5724), indicating that the cDNA insert coded for rat apoA-II. Further evidence was provided by a comparison of the amino acid sequence of rat apoA-II obtained here with that of human apoA-II (Brewer et al. 1972. Proc. Natl. Acad. Sci. USA. 69: 1304-1308). While the rat apoA-II cDNA insert did not code for the entire presegment, it had the same COOH-terminal residues of the presegment as well as the same prosegment (Ala-Leu-Val-Arg-Arg) as in human preproapoA-II, suggesting that rat apoA-II was also synthesized initially as preproapoA-II. Mature rat apoA-II contains 79 amino acids. Residue 6 of mature rat apoA-II is Asp, while it is Cys in human apoA-II, and this would account for the absence of dimeric forms of rat apoA-II in plasma. While the overall amino acid sequence homology between rat and human apoA-II is about 50%, the amphipathic alpha-helical structures, which are responsible for lipid-binding, seem to be conserved in the two proteins. The size of rat apoA-II mRNA was estimated to be about 600 nucleotides.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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