Expression profiling, immune functions, and molecular characteristics of the tetraspanin molecule CD63 from Amphiprion clarkii.

Developmental and Comparative Immunology
D S LiyanageJehee Lee

Abstract

CD63, a member of the tetraspanin family, is involved in the activation of immune cells, antiviral immunity, and signal transduction. The economically important anemonefishes Amphiprion sp. often face disease outbreaks, and the present study aimed to characterize CD63 in Amphiprion clarkii (denoted AcCD63) to enable better disease management. The in-silico analysis revealed that the AcCD63 transcript is 723 bp long and encodes 240 amino acids. The 26.2 kDa protein has a theoretical isoelectric point of 5.51. Similar to other tetraspanins, AcCD63 consists of four domains: short N-/C-terminal domains and small/large extracellular loops. Pairwise sequence alignment revealed that AcCD63 has the highest identity (100%) and similarity (99.2%) with CD63 from Amphiprion ocellaris. Multiple sequence alignment identified a conserved tetraspanin CCG motif, PXSCC motif, and C-terminal lysosome-targeting GYEVM motif. The quantitative polymerase chain reaction analysis showed that AcCD63 was highly expressed in the spleen and head kidney tissue, with low levels of expression in the liver. Temporal expression patterns of AcCD63 were measured in the head kidney and blood tissue after injection of polyinosinic:polycytidylic acid (poly (I:C)), l...Continue Reading

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