L-C1qDC-1, a novel C1q domain-containing protein from Lethenteron camtschaticum that is involved in the immune response.
The C1q domain-containing (C1qDC) proteins are a family of proteins characterized by a globular C1q (gC1q) domain at their C-terminus. These proteins are involved in various processes in vertebrates and are assumed to serve as important pattern recognition receptors in innate immunity in invertebrates. Here, a novel C1qDC protein from Lethenteron camtschaticum was identified and characterized (designated as L-C1qDC-1). After a partial cDNA sequence of L-C1qDC-1 was identified in a L. camtschaticum liver cDNA library, the full-length cDNA was obtained using 3'- and 5'-rapid amplification of cDNA ends (RACE). L-C1qDC-1 encodes 236 amino acids and contains a signal peptide, a collagen-like sequence with Gly-Xaa-Yaa repeats, and a C-terminal gC1q domain. The L-C1qDC-1 protein was primarily distributed in the gut, liver and supraneural body of L. camtschaticum and was also marginally detectable in leukocytes via real-time PCR and immunofluorescence assays. Furthermore, both immunoprecipitation and immunofluorescence results showed that in L. camtschaticum serum, L-C1qDC-1 could interact with variable lymphocyte receptor (VLR) B and displayed strong colocalization with cancer cell immune responses. These results indicated that the L-C1qDC-1 gene encodes a novel C1qDC protein that may play an important role in the immune responses of L. camtschaticum, providing clues for understanding the universal functions of C1qDC proteins in other species and suggesting that these proteins could serve as pattern recognition molecules in immunotherapy.
College of Life Sciences, Liaoning Normal University, Dalian 116081, China; Lamprey Research Center, Liaoning Normal University, Dalian 116081, China.
Guangying
G
Pei
College of Life Sciences, Liaoning Normal University, Dalian 116081, China; Lamprey Research Center, Liaoning Normal University, Dalian 116081, China.
Ge
G
Liu
College of Life Sciences, Liaoning Normal University, Dalian 116081, China; Lamprey Research Center, Liaoning Normal University, Dalian 116081, China.
Xiong
X
Pan
College of Life Sciences, Liaoning Normal University, Dalian 116081, China; Lamprey Research Center, Liaoning Normal University, Dalian 116081, China. Electronic address: pangyue01@163.com.
Yue
Y
Pang
College of Life Sciences, Liaoning Normal University, Dalian 116081, China; Lamprey Research Center, Liaoning Normal University, Dalian 116081, China. Electronic address: liqw@lnnu.edu.cn.
Qingwei
Q
Li
D000595:Amino Acid Sequence; D000818:Animals; D015153:Blotting, Western; D003001:Cloning, Molecular; D015922:Complement C1q / Q000235:genetics / Q000276:immunology*; D005455:Fluorescent Antibody Technique; D007113:Immunity, Innate / Q000235:genetics / Q000276:immunology*; D007150:Immunohistochemistry; D047468:Immunoprecipitation; D007798:Lampreys / Q000235:genetics / Q000276:immunology*; D008969:Molecular Sequence Data; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D017434:Protein Structure, Tertiary / Q000235:genetics; D051192:Receptors, Pattern Recognition / Q000235:genetics / Q000276:immunology; D017386:Sequence Homology, Amino Acid
D051192:Receptors, Pattern Recognition; D015922:Complement C1q
Immune response; L-C1qDC-1 protein; Lethenteron camtschaticum