Comparative analysis of serine protease‐related genes in the honey bee genome: possible involvement in embryonic development and innate immunity

Abstract

We have identified 44 serine protease (SP) and 13 serine protease homolog (SPH) genes in the genome of Apis mellifera . Most of these genes encode putative secreted proteins, but four SPs and three SPHs may associate with the plasma membrane via a transmembrane region. Clip domains represent the most abundant non‐catalytic structural units in these SP‐like proteins −12 SPs and six SPHs contain at least one clip domain. Some of the family members contain other modules for protein–protein interactions, including disulphide‐stabilized structures (LDL r A, SRCR, frizzled, kringle, Sushi, Wonton and Pan/apple), carbohydrate‐recognition domains (C‐type lectin and chitin‐binding), and other modules (such as zinc finger, CUB, coiled coil and Sina). Comparison of the sequences with those from Drosophila led to a proposed SP pathway for establishing the dorsoventral axis of honey bee embryos. Multiple sequence alignments revealed evolutionary relationships of honey bee SPs and SPHs with those in Drosophila melanogaster , Anopheles gambiae , and Manduca sexta . We identified homologs of D. melanogaster persephone, M. sexta HP14, PAP‐1 and SPH‐1. A. mellifera genome includes at least five genes for potential SP inhibitors (serpin‐1 through ‐5) and three genes of SP putative substrates (prophenoloxidase, spätzle‐1 and spätzle‐2). Quantitative RT‐PCR analyses showed an elevation in the mRNA levels of SP2, SP3, SP9, SP10, SPH41, SPH42, SP49, serpin‐2, serpin‐4, serpin‐5, and spätzle‐2 in adults after a microbial challenge. The SP41 and SP6 transcripts significantly increased after an injection of Paenibacillus larva , but there was no such increase after injection of saline or Escherichia coli . mRNA levels of most SPs and serpins significantly increased by 48 h after the pathogen infection in 1st instar larvae. On the contrary, SP1, SP3, SP19 and serpin‐5 transcript levels reduced. These results, taken together, provide a framework for designing experimental studies of the roles of SPs and related proteins in embryonic development and immune responses of A. mellifera .

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