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Identification and characterization of troponin genes in Locusta migratoria.
Insect Molecular Biology ( IF 2.3 ) Pub Date : 2020-05-06 , DOI: 10.1111/imb.12644
H-F Liang 1, 2 , J Li 1 , X-D Li 1, 2
Affiliation  

Troponin complex comprises three subunits, namely troponin C (TpnC), troponin I (TpnI) and troponin T (TpnT), and regulates the contraction of striated muscle. We found that the locust Locusta migratoria genome has one TpnT gene (LmTpnT), one TpnI gene (LmTpnI) and three TpnC genes (LmTpnC1, LmTpnC2 and LmTpnC3). Through alternative splicing, LmTpnT and LmTpnI potentially encode two and eight isoforms, respectively. The flight muscle and the jump muscle of L. migratoria express an identical LmTpnT isoform, but different LmTpnC isoforms and LmTpnI isoforms. LmTpnC2 and LmTpnC3 both contain highly conserved residues essential for calcium binding in the EF‐hand II and IV, thus belonging two‐site isoform. LmTpnC1 contains non‐conserved substitutions in the EF‐hand II and all highly conserved residues for calcium binding in the EF‐hand IV. Mutagenesis and tyrosine fluorescence spectroscopic analysis show that both the EF‐hand II and IV of LmTpnC1 can serve as calcium‐binding site. Therefore, all three LmTpnC isoforms belong to two‐site isoform. This is in contrast to the situation in the insect with asynchronous flight muscle, which expresses both one‐site isoform and two‐site isoform of TpnC. Those results suggest that the origination of insect asynchronous flight muscle is associated with the emergence of one‐site isoform of TpnC.

中文翻译:

南方蝗中肌钙蛋白基因的鉴定与表征。

肌钙蛋白复合物包含三个亚基,即肌钙蛋白C(TpnC),肌钙蛋白I(TpnI)和肌钙蛋白T(TpnT),并调节横纹肌的收缩。我们发现,蝗虫:飞蝗基因组有一个TpnT基因(LmTpnT),一个TpnI基因(LmTpnI)和三个TpnC基因(LmTpnC1LmTpn C2LmTpn C3)。通过替代剪接,LmTpnTLmTpnI可能分别编码两个和八个同工型。L的飞行肌肉和跳跃肌肉。移民表达相同的LmTpnT同工型,但表达不同的LmTpnC同工型和LmTpnI同工型。LmTpnC2和LmTpnC3都包含高度保守的残基,这些残基对于EF-hand II和IV中的钙结合至关重要,因此属于两个位点的同工型。LmTpnC1在EF-hand II中包含非保守取代,并且在EF-hand IV中包含所有高度保守的钙结合残基。诱变和酪氨酸荧光光谱分析表明,LmTpnC1的EF手II和IV均可作为钙结合位点。因此,所有三个LmTpnC同工型都属于两个位点同工型。这与具有异步飞行肌肉的昆虫的情况相反,后者的昆虫同时表达了TpnC的一个位点同工型和两个位点的同工型。
更新日期:2020-05-06
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