Korean Journal of Plant Tissue Culture (식물조직배양학회지)

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Complete Nucleotide Sequence Analysis and Structural Comparison of 3 members of Tomato Phenylalanine ammonia-lyase gene

토마토에서 분리한 3종류의 Phenylalanine ammonia-lyase gene에 대한 염기서열 및 특성비교

  • 여윤수 (농촌진흥청 농업과학기술원 생물자원부) ;
  • 예완해 (농촌진흥청 농업과학기술원 생물자원부) ;
  • 이신우 (농촌진흥청 농업과학기술원 생물자원부) ;
  • 배신철 (농촌진흥청 농업과학기술원 생물자원부) ;
  • 류진창 (농촌진흥청 농업과학기술원 생물자원부) ;
  • 장영덕 (충남대학교 농과대학 농생물학과)
  • Published : 1999.01.01
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Abstract

Phenylalanine ammonia-lyase (PAL; EC 4, 3, 1, 5) genomic clones were isolated from tomato(Lycopersicon esculentum L.) genomic DNA libraries using tomato PAL5 cDNA sequences as probes. The nucleotide sequences of tPAL1, tPAL4 and tPAL5 were compared. tPAL5 contains an open reading frame encoding a polypeptide of 722 amino acids, interrupted by a 710 bp intron in the codon for the amino acid 139. tPAL1 encodes a polypeptide of 249 amino acids which is much shorter than tPAL5 gene due to a premature stop codon and does not contain an intron. tPAL4 encodes a polypeptide of 357 amino acids, interrupted by a 305 bp intron in the codon for the amino acid 138. Premature stop codons observed in tPAL1 and tPAL4 gene produce a short polypeptide rather than a normal polypeptide (722 aa). tPALl shows 87.2% homology with tPAL4 and 85.3% homology with tPAL5 gene whereas tPAL4 showes 91.4% homology with tPAL5 at nucleotide level. In general, phylogenetic analysis showed that genes isolated from tomato, potato, and sweet potato were belong to the same group and another dicot plants such as parsley, bean, soybean, pea and alfalfa formed another group. PAL genes isolated from rice and yeast showed very low homology with other PAL genes and formed the other group.

토마토의 genomic DNA library로부터 분리한 tPALl, tPAL4유전자의 염기서열을 분석하여 tPAL5 유전자와 비교 분석한 결과는 다음과 같다. tPAL5 유전자는 722개의 아미노산과 710 bp의 intron을 가지고 있으나 tPALl은 intron을 가지고 있지 않으며 또한 tPAL5 유전자와 비교하여 249개의 짧은 polypeptide를 가지고 있었다. tPAL4유전자인 경우 357개의 아미노산과 305bp의 intron을 가지고 있었다. tPAL 효소간의 아미노산 homology는 tPAL1유전자와 tPAL4 유전자간은 87.2%, tPALl과 tPAL5는 85.3%, tPAL4 와 tPAL5 는 91.4%의 homology를 보였다. 또한, tPALl, tPAL4 유전자는 정상적인 polypeptide를 가지는 tPAL5유전자와 비교하여 비정상적인 stop codon을 가진 짧은 polypeptide로 구성되어 있었다. 다양한 식물 종으로부터 분리된 PAL유전자의 염기서열을 비교한 결과 토마토 (Lycopersicon esculentum), 감자 (Solanum tuberosum), 고구마 (Ipomoea batatas)간의 유연관계과 높았으며, parsley (Petroselinum crispum), bean (Phaseolus vulgaris), pea (Pisum sativum), alfalfa (Medicago sativa) 등이 각각 서로간에 유연관계가 높았다. 또한, 토마토에서 분리한 family내에서 tPAL4와 tPAL5 유전자는 homology가 매우 높았고 (93.0%), tPAL1와 tPAL4유전자 사이는 다소 낮았으며 (84.4%), 특히 tPAL4는 감자의 PAL 유전자와 매우 높았다 (90.6%).

Keywords

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