Molecular cloning and characterization of a thioredoxin/nucleoside diphosphate kinase related dynein intermediate chain from the ascidian, Ciona intestinalis

Gene. 2001 Sep 5;275(1):177-83. doi: 10.1016/s0378-1119(01)00661-8.


Flagellar outer arm dynein from the ascidian, Ciona intestinalis, contains five intermediate chains (IC1-5). Molecular cloning of C. intestinalis IC3 shows significant sequence homology to the dynein intermediate chain (IC1) from sea urchin and human NM23-H8 protein. The N-terminal thioredoxin-related region is well conserved in the C. intestinalis IC3, sea urchin IC1, and human NM23-H8 protein. Three NDP kinase (NDPK)-related sequences are present in middle portions of both C. intestinalis IC3 and sea urchin IC1, but the human NM23-H8 protein had only two. A large part of the C-terminal glutamic acid-rich region present in sea urchin IC1 was greatly reduced in C. intestinalis IC3 and completely lost in human NM23-H8. Thus, thioredoxin/NDPK-related dynein intermediate chains (TNDK-DIC) would be a characteristic of metazoan flagella and they have become smaller in size and less acidic during evolution.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Ciona intestinalis / enzymology
  • Ciona intestinalis / genetics*
  • Cloning, Molecular
  • DNA, Complementary / chemistry
  • DNA, Complementary / genetics
  • DNA, Complementary / isolation & purification
  • Dyneins / genetics*
  • Dyneins / isolation & purification
  • Humans
  • Male
  • Molecular Sequence Data
  • Nucleoside-Diphosphate Kinase / genetics
  • Sea Urchins / genetics
  • Sequence Alignment
  • Sequence Analysis, DNA
  • Sequence Homology, Amino Acid
  • Sperm Tail / enzymology
  • Thioredoxins / genetics


  • DNA, Complementary
  • Thioredoxins
  • Nucleoside-Diphosphate Kinase
  • Dyneins

Associated data

  • GENBANK/AB057786