ANALYSIS OF THE PARAMYOSIN MINIPARAMYOSIN GENE - MINIPARAMYOSIN IS AN INDEPENDENTLY TRANSCRIBED, DISTINCT PARAMYOSIN ISOFORM, WIDELY DISTRIBUTED IN INVERTEBRATES

被引:39
作者
MAROTO, M
ARREDONDO, JJ
SANROMAN, M
MARCO, R
CERVERA, M
机构
[1] UNIV AUTONOMA MADRID, FAC MED, CSIC, DEPT BIOQUIM, E-28029 MADRID, SPAIN
[2] UNIV AUTONOMA MADRID, FAC MED, CSIC, INST INVEST BIOMED, E-28029 MADRID, SPAIN
关键词
D O I
10.1074/jbc.270.9.4375
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Miniparamyosin, a distinct Drosophila melanogaster paramyosin isoform of 60 kDa, is shown here to be encoded by the same gene as paramyosin. The gene, located at 66D14, spans over 12.8 kilobases (kb) and is organized into 10 exons, 9 of which code for the paramyosin transcripts, An exon, located between exons 7 and 8, codes for the 5'-end of the miniparamyosin, and the two proteins share the two last exons of the gene, Mapping of the 5'-ends of these transcripts indicates that the paramyosin and miniparamyosin mRNAs arise from two overlapping transcriptional units; the miniparamyosin transcription initiation site is located inside a paramyosin intron, 8 kb downstream of the one used for paramyosin transcription, The existence of two differ ent promoters and the conserved and nonconserved features of their sequences suggest a very complex regulation of these two muscle proteins, In fact, while paramyosin is expressed at two distinct stages of development as most other Drosophila muscle proteins, miniparamyosin appears late in development, being present only in the adult musculature, The absence of exon 1B, the specific exon of miniparamyosin, in the nematode Caenorhabditis elegans, as web as additional lines of evidence support the lack of miniparamyosin in this particular organism, However, it is present in most invertebrate species examined, including different arthropod, annelid, mollusc, and echinoderm species.
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页码:4375 / 4382
页数:8
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