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园艺学报 ›› 2013, Vol. 40 ›› Issue (4): 675-.

• 蔬菜 • 上一篇    下一篇

芥菜开花负调因子SVP 及FLC 同源互作域筛选和作用强度分析

 汤青林, 丁 宁, 李念祖, 王志敏, 宋 明   

  1. (西南大学园艺园林学院,南方山地园艺学教育部重点实验室,重庆市蔬菜学重点实验室,重庆 400715)
  • 出版日期:2013-04-25 发布日期:2013-04-25

Evaluation of Acting Domain and Strength Mediating the Protein Self-interactions of SVP and FLC in Brassica juncea

 TANG  Qing-Lin, DING   Ning, LI  Nian-Zu, WANG  Zhi-Min, SONG   Ming   

  1. (College of Horticulture and Landscape Architecture,Southwest University;Key Laboratory of Horticulture Science for
    Southern Mountainous Regions,Ministry of Education;Key Laboratory of Olericulture,Chongqing 400715,China)
  • Online:2013-04-25 Published:2013-04-25

摘要: 为探明芥菜开花负调因子SVP、FLC 自身聚合的分子机制及其蛋白作用模式,利用酵母双
杂交体系,分别对SVP、FLC 蛋白自身聚合及其作用强度进行研究。结果表明:酵母菌Y187 转化子
Y187-pGADT7SVP 和Y187-pGADT7SVP2 ~ 5 均能与酵母菌Y2HGold 转化子Y2HGold-pGBKT7SVP 融合,
并可在选择性固体培养基QDO/X/A 上长出蓝色菌落,而Y187-pGADT7SVP1 × Y2HGold-pGBKT7SVP 不
能在QDO/X/A 生长。说明SVP 蛋白能自身聚合,且与截短体SVP2 ~ 5 同源结合,SVP 蛋白自身聚合需
要核心作用域K 域参与。尽管MI 域不能单独介导SVP 自身聚合,但它的存在却能使SVP 自身聚合作用
增强,C 域有可能会削弱该作用。同时,Y2HGold-pGBKT7FLC 和Y2HGold-pGBKT7FLC2 ~ 5 也能与
Y187-pGADT7FLC 融合,同时激活报告基因AUR1-C、HIS3、ADE2、MEL1,FLC 能与截短体FLC2 ~ 5
同源互作。K 域是FLC 蛋白自身聚合必须的,I 域会增强这一作用。SVP 和FLC 的核心作用域K 域均由
K1、K2 和K3 亚域组成,形成3 个经典的α 螺旋,K 域有9 个高度保守的氨基酸位点及蛋白互作的结构
模体(亮氨酸拉链)。

关键词: 芥菜, 截短体, SVP, FLC, 酵母双杂交

Abstract: For further study on the molecular mechanism and interaction model of SVP and FLC
protein homologous dimerization in flowering control in Brassica juncea Coss.(mustard),the selfinteractions
of SVP and FLC were detected by the yeast two-hybrid system. The yeast stains of
pGADT7SVP or pGADT7SVP2–5 could mate with pGBKT7SVP,which grew on selective agar plates
QDO/X/A(SD/-Ade/-His/-Leu/-Trp/X-α-Gal/AbA)with blue stains. However,Y187-pGADT7SVP1 and
Y2HGold-pGBKT7SVP could not mate into zygote diploids to grow on selective plates DO/X/A. The
results showed that SVP or SVP2–5 truncated forms could act with SVP itself to combine and form
homodimers. K domain of SVP was the key amino acid region to independently mediate and determine the
homologous dimerization. MI-domain of SVP alone could not induce the self-interactions of SVP,but
enhance the strength of homologous interactions. However,C-domain of SVP could weaken the protein
self-interaction strength. The yeast stains of pGBKT7FLC2–5 and pGADT7FLC could mate into zygotes
and grew on selective agar plates QDO/X/A with blue stains. The DNA-BD and AD were brought into
proximity to activate transcription of four independent reporter genes(AUR1-C,HIS3,ADE2,MEL1).
FLC2–5 truncated forms and FLC protein could act with each other to form homodimers. It also indicated
that K domain of FLC may play an important role in mediating the FLC homodimers. However,I-domain
of FLC could strengthen the protein self-interactions. Alignment analysis of K domain sequence showed
that K domain was consist of three subdomains(K1,K2 and K3)and formed three ? helixes. Nine high
conservative amino acids existed in K domain. Leucine zippers,protein interaction motifs,lied in K
domain.

Key words: Brassica juncea, truncated forms, SVP, FLC, yeast two-hybrid system

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