Ribosomal proteins L34 and S29 of amphioxus Branchiostoma belcheri tsingtauense: cDNAs cloning and gene copy number

• Autorzy: Liu L. , Zhang S. , Liu Z. , Li H. , Liu M. , Wang Y. , Ma L.
• Języki publikacji: EN

Abstrakty

EN

The complete cDNA and deduced amino-acid sequences of ribosomal proteins L34 (AmphiL34) and S29 (AmphiS29) from the amphioxus Branchiostoma belcheri tsingtauense were identified in this study. The AmphiL34 cDNA is 435 nucleotides in length and encodes a 118 amino-acid protein with calculated molecular mass of 13.6 kDa. It shares 53.6-67.5% amino-acid sequence identity with its eukaryotic counterparts including human, mouse, rat, pig, frog, catfish, fruit fly, mosquito, armyworm, nematode and yeast. The AmphiS29 cDNA comprises 453 nucleotides and codes for a 56 amino-acid protein with a calculated molecular mass of 6.6 kDa. It shows 66.1-78.6% amino-acid sequence identity to eukaryotic S29 proteins from human, mouse, rat, pig, zebrafish, seahorse, fruit fly, nematode, sea hare and yeast. AmphiL34 contains a putative nucleolar localization signal, while AmphiS29 has a zinc finger-like domain. A phylogenetic tree deduced from the conserved sequences of AmphiL34 and AmphiS29 and other known counterparts indicates that the positions of AmphiL34/AmphiS29 are intermediate between the vertebrate and invertebrate L34/S29. Southern blot analysis demonstrates the presence of one copy of the L34 gene and 2-3 copies of the S29 gene in the genome of the amphioxus B. belcheri tsingtauense. This is in sharp contrast to the existence of 7-9 copies of the L34 gene and 14-17 copies of the S29 gene in the rat genome. These date suggest that housekeeping genes like AmphiL34 and AmphiS29 have undergone large-scale duplication in the chordate lineage.

Słowa kluczowe

EN

amphioxus; cDNA cloning; ribosomal protein; amino acid sequence; gene copy number; Branchiostoma belcheri tsingtauense

• Wydawca: -
• Czasopismo: Acta Biochimica Polonica
• Rocznik: 2005
• Tom: 52
• Numer: 4
• Opis fizyczny: p.857-862,fig.,ref.

Twórcy

autor

Liu L.

• Ocean University of China, Qingdao 266003, PR China

autor

Zhang S.

autor

Liu Z.

autor

Li H.

autor

Liu M.

autor

Wang Y.

autor

Ma L.

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