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The primary structure of a chondrichthyan protamine: a new apparent contradiction in protamine evolution
Saperas, N.; Buesa, C.; Abián, J.; Vandekerckhove, J.; Kasinsky, H.E.; Chival, M. (1996). The primary structure of a chondrichthyan protamine: a new apparent contradiction in protamine evolution. J. Mol. Evol. 43(5): 528-535. dx.doi.org/10.1007/PL00006113
In: Journal of Molecular Evolution. Springer-Verlag: New York. ISSN 0022-2844, more
Peer reviewed article  

Available in  Authors 

Keyword
    Marine
Author keywords
    protamine; primary structure; sperm nucleic basic proteins

Authors  Top 
  • Saperas, N.
  • Buesa, C.
  • Abián, J.
  • Vandekerckhove, J.
  • Kasinsky, H.E.
  • Chival, M.

Abstract
    We have determined the primary structure of protamine R3 from ratfish (Hydrolagus colliei), a species belonging to the order Chimaeriformes (an old phylogenetic line among the chondrichthyes). Protamine R3 contains 48 residues organized as follows: ARRRH SMKKK RKSVR RRKTR KNQRK RKNSL GRSFK (Q/A)HGFL KQPPR FRP. Comparison of this sequence with both protamine Z3 from Scyliorhinus canicula (a chondrichthyan) and typical protamines from bony fish generates an apparent contradiction: Two relatively close species (H. colhei and S. canicula, both chondichthyes) display different protamines, whereas species more distant in evolution (S. canicula and bony fish) contain very similar protamine molecules. We note that this is not an isolated case in the evolution of sperm nuclear basic proteins (SNBPs) and discuss the possible significance of this fact.

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