Recovery of cDNAs encoding ribosomal proteins S9 and L26 fromAedes albopictus mosquito cells and identification of their homologs in the malaria vector,Anopheles gambiae

Abstract

We used PCR-based approaches to obtain the full-length cDNA sequences encoding ribosomal protein (Rp) S9 and L26 from a mosquito (Aedes albopictus) C7-10 cell line. The deduced mosquito RpS9 protein has a mass of 22,826 Da and a pI of 11.41, while RpL26 had a mass of 17,442 Da and a pI of 11.52. Both cDNAs initiated with the 5'-polypyrimidine motif characteristic of ribosomal protein transcripts. Using the Aedes protein and nucleic acid sequences, we identified rpS9 and rpL26 as single copy genes in the Anopheles gambiae genome. In An. gambiae, the RpS9 coding region was distributed over 3 exons, spanning 2.6 kb, but the Anopheles rpL26 protein coding region lacked introns. The Aedes and Anopheles RpS9 and RpL26 proteins shared 96 and 92% identity, respectively. Despite low numbers of parsimony-informative amino acid substitutions, phylogenies based on the ribosomal protein sequences accurately group the Aedes and Anopheles proteins with high bootstrap values.