Dataset Information

Isolation of mouse CD44 cDNA: structural features are distinct from the primate cDNA.

ABSTRACT: CD44 is a glycoprotein that participates in adhesion of lymphocytes to high endothelial cells of lymph organs and likely functions in other intercellular adhesions as well. We have isolated a mouse CD44 cDNA by polymerase chain reaction amplification of cDNA synthesized from total cellular RNA isolated from 38C-13, a B-lymphocyte cell line. The oligonucleotide sequences were based at the 5' end on the baboon CD44 sequence upstream of and including the translation initiator ATG and at the 3' end on a mouse CD44 sequence that was determined from a rare, incomplete cDNA clone. The mouse CD44 DNA sequence is similar to the baboon CD44 sequence but has structural features that are distinct. The external domain has a region that is only 35% similar between the mouse and primate proteins, in contrast to 85%-90% similarity in the rest of the sequence. In addition, just upstream from the predicted cleavage site of the leader peptide, nucleotide insertions result in the addition of two or four amino acids, depending upon the mouse strain. An amino acid replacement between two strains carrying different CD44 (also called Pgp-1) allotypes is likely responsible for the Pgp-1 polymorphism. The most striking aspect of mouse CD44 is that the RNA does not fractionate with polyadenylylated RNA, unlike the CD44 RNA in human, baboon, rat, and chicken.

SUBMITTER: Nottenburg C

PROVIDER: S-EPMC298314 | biostudies-other | 1989 Nov

REPOSITORIES: biostudies-other

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Isolation of mouse CD44 cDNA: structural features are distinct from the primate cDNA.

Nottenburg C C Rees G G St John T T

Proceedings of the National Academy of Sciences of the United States of America 19891101 21

CD44 is a glycoprotein that participates in adhesion of lymphocytes to high endothelial cells of lymph organs and likely functions in other intercellular adhesions as well. We have isolated a mouse CD44 cDNA by polymerase chain reaction amplification of cDNA synthesized from total cellular RNA isolated from 38C-13, a B-lymphocyte cell line. The oligonucleotide sequences were based at the 5' end on the baboon CD44 sequence upstream of and including the translation initiator ATG and at the 3' end ...[more]

PMID: 2682651

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Project description:BackgroundThe mouse mammary tumor virus (MMTV) is unique from other retroviruses in having multiple viral promoters, which can be regulated by hormones in a tissue specific manner. This unique property has lead to increased interest in studying MMTV replication with the hope of developing MMTV based vectors for human gene therapy. However, it has recently been reported that related as well as unrelated retroviruses can cross-package each other's genome raising safety concerns towards the use of candidate retroviral vectors for human gene therapy. Therefore, using a trans complementation assay, we looked at the ability of MMTV RNA to be cross-packaged and propagated by an unrelated primate Mason-Pfizer monkey virus (MPMV) that has intracellular assembly process similar to that of MMTV.ResultsOur results revealed that MMTV and MPMV RNAs could be cross-packaged by the heterologous virus particles reciprocally suggesting that pseudotyping between two genetically distinct retroviruses can take place at the RNA level. However, the cross-packaged RNAs could not be propagated further indicating a block at post-packaging events in the retroviral life cycle. To further confirm that the specificity of cross-packaging was conferred by the packaging sequences (psi), we cloned the packaging sequences of these viruses on expression plasmids that generated non-viral RNAs. Test of these non-viral RNAs confirmed that the reciprocal cross-packaging was primarily due to the recognition of psi by the heterologous virus proteins.ConclusionThe results presented in this study strongly argue that MPMV and MMTV are promiscuous in their ability to cross-package each other's genome suggesting potential RNA-protein interactions among divergent retroviral RNAs proposing that these interactions are more complicated than originally thought. Furthermore, these observations raise the possibility that MMTV and MPMV genomes could also co-package providing substrates for exchanging genetic information.

Dataset Information

Isolation of mouse CD44 cDNA: structural features are distinct from the primate cDNA.

Publications

Isolation of mouse CD44 cDNA: structural features are distinct from the primate cDNA.

Similar Datasets

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