Abstract:
:Aminopeptidase H11, an integral membrane glycoprotein present only in the gut of Haemonchus contortus, could provide substantial protection as shown by 90% reduction in fecal egg counts, while its recombinant version expressed in E. coli induced little. To investigate the characteristics further, we amplified mRNA of H11 gene via reverse transcriptase polymerase chain reaction, followed by isolation of its 1,517-bp 5'-flanking region and determination of its genomic organization. The H11 gene contained 25 exons separated by 24 introns and spans 14,959 bp of genomic DNA. Analysis of the 1,517 bp 5'-flanking region of the H11 gene revealed a putative "TATA-less" promoter. Partial sequences of the last exon and its 3'-UTR of H11 isoform H11-4 were also identified upstream to the H11 gene with the same transcription orientation. The 1,517-bp 5'-flanking region and part of the first exon of the H11 gene were subcloned into the vector upstream of green fluorescence protein reporter gene and microinjected into the gonads of Caenorhabditis elegans. The transformed animals exhibited fluorescence in the distal intestine in the L4 larvae stage and adult worms. This study characterized gene structure of aminopeptidase H11, demonstrated different transcriptional pattern of its promoter region between free-living and blood-sucking nematode species, and highlights the utility of C. elegans as a heterologous system to study the biology roles of H11 isoforms.
journal_name
Funct Integr Genomicsjournal_title
Functional & integrative genomicsauthors
Zhou QJ,Zhang HL,Jiang XL,Du AFdoi
10.1007/s10142-010-0172-5subject
Has Abstractpub_date
2010-11-01 00:00:00pages
589-601issue
4eissn
1438-793Xissn
1438-7948journal_volume
10pub_type
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