Part:BBa_K771005

Membrane Anchor 5:ssDsbA-VVD-LGT-GBD Ligand

Membrane anchor 5, which consists of blue light sensor VVD(BBa_K771109) ,PDZ ligand(BBa_K771104) and membrane protein Lgt(BBa_K771102). Membrane Anchor 5 is proved to constitutively dimerize with Membrane Anchor 4 [BBa_K771004] and could aggregate with Membrane Anchor 6 [BBa_K771006] only when blue light is present.

Overview: Membrane Scaffold System

Demonstration of the whole Membrane Scaffold device. Membrane Anchor 2, 3, 4, 5 consitutively aggregate while Membrane Anchor 1 and 6 only aggregate with

constitutive cluster (Membrane Anchor 2, 3, 4, 5) when certain signal is present.

Backgroud

Blue Light Induced Aggregation

We incorporated VVD(BBa_K771109) as a blue light sensor to control the aggregation state of Membrane Scaffold system. VVD is a photoreceptor of Neurospora crassa and can form dimer only in the presence of blue light and disassociate as light is off. Mutant (C71V and N56K) is harder to dimerize in the dark and easier to disassociate under blue light compared with wildtype VVD.

When blue light is on, Membrane Anchor 5 and 6 aggregate, activating pathway involving enzymes 2, 3, 4, 5 and 6.

Constitutive Aggregation

File:12SJTU-CA45.png300px

Membrane Anchor 4 (BBa_K771003and Membrane Anchor 5 (with and without VVD) constitutively

aggregate through GBD domain(BBa_K771105) and GBD ligand

(BBa_K771106).

Characterization

We proved the constitutive interaction between membrane anchor 4 and 5 by fusing split EGFP to membrane anchor 4 and membrane anchor 5 without VVD. For more information, click BBa_K771008

We also justified the blue light induced aggregation ability of Membrane Anchor 5 and 6 by recruiting Violacein pathway in our system.

Design

Membrane Anchor 5 could constitutively aggregate with Membrane Anchor 4 and can aggregate with Membrane Anchor 6 only when blue light is on.

Application

We recruited Violacein biosynthetic pathway involving enzyme Vio A,B,C,D and E. Violacein biosynthetic pathway is a branched pathway which could lead to the producion of three final products.

Through blue light signal control, we successfully turned on a pathway which was otherwise almost shut off.

For more information, see BBa_K771201

Related Biobrick

<br\>Membrabe Anchor 1([BBa_K771001]) <br\>Membrabe Anchor 2([BBa_K771002]) <br\>Membrabe Anchor 3([BBa_K771003]) <br\>Membrabe Anchor 4([BBa_K771004]) <br\>Membrabe Anchor 6([BBa_K771006])

Reference

Dueber, J. E., G. C. Wu, et al. (2009). "Synthetic protein scaffolds provide modular control over metabolic flux." Nature biotechnology 27(8): 753-759.

Wang, X., X. Chen, et al. (2012). "Spatiotemporal control of gene expression by a light-switchable transgene system." Nature Methods.

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  INCOMPATIBLE WITH RFC[25]

  Illegal AgeI site found at 494
  Illegal AgeI site found at 1339
  
• 1000
  INCOMPATIBLE WITH RFC[1000]

  Illegal BsaI site found at 960