Structure of the tuf gene and its upstream part genes and characteristic analysis of conserved regions and activity from related gene promoters of a phytoplasma

YU Shaoshuai 1 LIN Caili 1 WANG Shengjie 1 ZHANG Wenxin 1 TIAN Guozhong 1

(1.Key Laboratory of Forest Protection of State Forestry Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091)

【Abstract】Studies on the genetic diversity, key gene regulation, and control of phytoplasma, which cause many diseases with various host plants and have a wide geographical distribution, will be conducive to facilitating concatenated disease control. The large DNA fragments including tuf gene sequences and upstream six genes from PaWB-sdyz, PaWB-fjfz and LY-fjya1 strains were amplified using long fragment PCR primers. The sequence characteristic of conserved regions of the phytoplasma gene promoter and MLSA were performed. The upstream sequences adjoining the tuf gene were recombined with promoter-probe vector pSUPV4 to analyze their promoter activity. The sequences, 12 745–12 748 bp in length, of upstream tuf genes were amplified from the three strains. The comparative analysis showed that the gene structure order of the tuf gene and its upstream six gene sequences of PaWB-sdyz, PaWB-fjfz, LY-fjya1, OY-M, AYWB, PAa, SLY, AT phytoplasma strains were identical in the arrangement of 5’-rplL-rpoB-rpoC-rps12-rps7-fusA-tuf-3’. The potential sequence pattern of conserved region of the phytoplasma promoter was deduced: T90T100G92T75G67A85 (−35 region); T90A96T92A98T73T90 (−10 region). The different phytoplasma strains were clearly divided with comparatively high bootstrap values based on MLSA of coding genes, non-coding sequences, and deduced amino acid sequences of rplL-tuf nucleotide sequences. Genetic variation was comparatively high in the non-coding nucleotide sequences. A 130-bp upstream sequence of the tuf gene in PaWB-fjfz, LY-fjya1 strains and a 129-bp upstream sequence of the tuf gene in CWB-hnsy1 strain, and three representative strains of three variation types of upstream sequences adjoining the tuf gene from 16SrI group, were tested for promoter activity.

【Keywords】 phytoplasma; promoter; gene structure; genetic diversity; multilocus sequence analysis;

【DOI】

【Funds】 National Natural Science Foundation of China (31370644)

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This Article

ISSN:1005-0094

CN:11-3247/Q

Vol 26, No. 07, Pages 738-748

July 2018

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Article Outline

Abstract

  • 1 Materials and methods
  • 2 Results
  • 3 Discussion
  • References