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Identification and Characterization of 30 K Protein Genes Found in Bombyx mori (Lepidoptera: Bombycidae)
Xiao-Feng Shi1, Yi-Nü Li2, Yong-Zhu Yi3
1The Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 12 Zhongguancun South Street Beijing, 100081, China The College of Biological Sciences, China Agricultural University, Beijing, 100094, China.
Abstract:
The 30 K proteins, the major group of hemolymph proteins in the silkworm, Bombyx mori (Lepidoptera: Bombycidae), are structurally related with molecular masses of ∼30 kDa and are involved in various physiological processes, e.g., energy storage, embryonic development, and immune responses. For this report, known 30 K protein gene sequences were used as Blastn queries against sequences in the B. mori transcriptome (SilkTransDB). Twenty-nine cDNAs (Bm30K-1-29) were retrieved, including four being previously unidentified in the Lipoprotein_11 family. The genomic structures of the 29 genes were analyzed and they were mapped to their corresponding chromosomes. Furthermore, phylogenetic analysis revealed that the 29 genes encode three types of 30 K proteins. The members increased in each type is mainly a result of gene duplication with the appearance of each type preceding the differentiation of each species included in the tree. Real-Time Quantitative Polymerase Chain Reaction (Q-PCR) confirmed that the genes could be expressed, and that the three types have different temporal expression patterns. Proteins from the hemolymph was separated by SDS-PAGE, and those with molecular mass of ∼30 kDa were isolated and identified by mass spectrometry sequencing in combination with searches of various databases containing B. mori 30K protein sequences. Of the 34 proteins identified, 13 are members of the 30 K protein family, with one that had not been found in the SilkTransDB, although it had been found in the B. mori genome. Taken together, our results indicate that the 30 K protein family contains many members with various functions. Other methods will be required to find more members of the family.
Insights
The silkworm's 30K proteins are a large family involved in vital functions. This study identified 29 new genes and confirmed diverse expression patterns, revealing a complex protein family with many members and varied roles.
Area of Science:
- * Entomology and Molecular Biology
- * Biochemistry and Genomics
Background:
- * 30K proteins are major hemolymph proteins in silkworms (Bombyx mori), crucial for energy storage, development, and immunity.
- * Understanding the diversity and function of this protein family is essential for silkworm biology.
Purpose of the Study:
- * To identify and characterize the full complement of 30K protein genes in Bombyx mori.
- * To analyze the genomic structure, phylogenetic relationships, and expression patterns of these genes.
- * To identify 30K proteins in hemolymph using proteomic techniques.
Main Methods:
- * Bioinformatic analysis using Blastn against the Bombyx mori transcriptome (SilkTransDB).
- * Genomic structure analysis, chromosomal mapping, and phylogenetic analysis.
- * Real-Time Quantitative Polymerase Chain Reaction (Q-PCR) for gene expression analysis.
- * Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis (SDS-PAGE) and mass spectrometry for protein identification.
Main Results:
- * Twenty-nine cDNAs (Bm30K-1-29) encoding 30K proteins were identified, including novel members of the Lipoprotein_11 family.
- * Phylogenetic analysis revealed three distinct types of 30K proteins, with gene duplication being a primary driver of expansion.
- * Q-PCR confirmed gene expression, demonstrating distinct temporal patterns for the three types.
- * Mass spectrometry identified 34 proteins in hemolymph, with 13 confirmed as 30K protein family members, including one previously uncharacterized in the transcriptome.
Conclusions:
- * The 30K protein family in Bombyx mori is extensive and comprises at least three distinct types.
- * Gene duplication has played a significant role in the evolution of this protein family.
- * These proteins exhibit diverse temporal expression patterns, suggesting varied functional roles.
- * Further research is needed to discover additional members and fully elucidate the functions of the 30K protein family.
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