title: Molecular cloning and analysis of function of nucleoside diphosphate kinase (NDPK) from the scallop Chlamys farreri.
abstract: Nucleoside diphosphate kinase (NDPK) is a key metabolic enzyme that catalyzes the synthesis of non-adenine nucleoside triphosphate (NTP) by transferring the terminal phosphate between nucleoside diphosphate (NDP) and NTP. NDPK regulates a variety of eukaryotic cellular activities including cell proliferation, development, and differentiation. The ndpk cDNA was cloned from the hemocytes of the scallop Chlamys farreri and designated Cf-ndpk. The full-length sequence of Cf-ndpk consists of 715 bp encoding a polypeptide of 153 amino acids with a calculated molecular mass of 16927.52 daltons and pI of 7.64. The mRNA expression and distribution of Cf-ndpk in both bacterially challenged and unchallenged scallops were studied by Northern blotting and in situ hybridization. The results showed that Cf-ndpk transcripts were present in hemocytes, gill, adductor muscle, mantle, digestive gland, foot, and gonad, and the expression level increased in hemocytes after bacterial challenge. Recombinant Cf-NDPK expressed in Escherichia coli could transfer the terminal phosphate between UDP and ATP. The Cf-NDPK protein was present in all tested tissues including foot, adductor muscle, digestive gland, gonad, mantle, gill, and hemolymph. It was up-regulated in hemolymph after bacterial challenge. Taken together, these results suggest that NDPK may play roles in the innate immune response of scallop.
authors.affiliation: School of Life Sciences, Shandong University, Jinan, Shandong 250100, China. shixiuzhen82@163.com
authors.forename: Xiu-Zhen
authors.initials: XZ
authors.lastname: Shi
authors.forename: Xiao-Fan
authors.initials: XF
authors.lastname: Zhao
authors.forename: Jin-Xing
authors.initials: JX
authors.lastname: Wang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000302:isolation & purification; D006434:Hemocytes / Q000201:enzymology / Q000378:metabolism; D008969:Molecular Sequence Data; D009701:Nucleoside-Diphosphate Kinase / Q000235:genetics* / Q000378:metabolism / Q000502:physiology*; D049897:Pectinidae / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000302:isolation & purification; D017386:Sequence Homology, Amino Acid; D014018:Tissue Distribution
chemical_list: D018076:DNA, Complementary; D011994:Recombinant Proteins; D009701:Nucleoside-Diphosphate Kinase