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Revision as of 20:07, 10 October 2022

Biology

LvAPN1

LvAPN1, a 999-residue membrane-bound protein from the aminopeptidase N family, was identified in the in-house transcriptome of Litopenaeus vannamei hemocytes. It is presumed that it contains a putative N-terminal transmembrane domain, the Cry-binding region (CBR), the peptidase-M1 domain, the GAMEN domain and the HEXXH(X)18E zinc-binding site motifs. It proves that the LvAPN1 was involved in AHPND pathogenesis and acted as a VP_AHPND toxin PirAB^vp receptor by mediating the toxin penetration into hemocytes. LvAPN1 knockdown reduced the mortality, histopathological signs of AHPND in the hepatopancreas (1).

Usage and design

Considering that LvAPN1 is a protein expressed by eukaryotic animals, we intended to use the X-33 wild-type strain of Pichia pastoris to express the receptor rather than E. coli. In order to characterize LvAPN1 on the cell surface of Pichia pastoris, a His-tag (6×His) was added to the C-terminal of it. We used the common vector pPICZ B to express the LvAPN1-his, of which the sequence was inserted between the EcoR I and Xba I sites. The constructed plasmid were transformed into E. coli DH5α for plasmid propagation, then the positive transformants were selected by zeocin and confirmed by colony PCR and sequencing.

Characterization

Idedntification

After transforming the plasmid into E. coli DH5α, colony PCR was used to verify that the plasmid was correct. Target bands (3285 bp) can be observed at the position between 5000 bp and 3000 bp (Fig. 1).

Fig. 1 DNA gel electrophoresis of the colony PCR products of LvAPN1-his_pPICZ B.

Reference

1. W. Luangtrakul et al., Cytotoxicity of Vibrio parahaemolyticus AHPND toxin on shrimp hemocytes, a newly identified target tissue, involves binding of toxin to aminopeptidase N1 receptor. PLoS Pathog. 17, e1009463 (2021). Sequence and Features