Part:BBa_K4165032

HtrA1 Switch number 12

This composite part consists of T7 promoter (BBa_K3633015), lac operator (BBa_K4165062), pGS-21a RBS (BBa_K4165016), 6x His-tag (BBa_K4165020), SPINK8 Inhibitor (BBa_K4165010), GS Linker (BBa_K4165017), seed peptide (BBa_K4165012), GS Linker (BBa_K4165019), seed peptide (BBa_K4165012), GS Linker (BBa_K4165017), H1A (BBa_K4165000) and T7 terminator (BBa_K731721).

Usage and Biology

Switch 12 is used to mediate the activity of HTRA1. Activating HTRA1 requires a conformational change in the linker, eliminating the attached inhibitor from the active site. The conformational rearrangement can be mediated through the affinity clamp for tau and beta-amyloid binding. These clamps are used for stabilizing the inhibitor away from the active site. These two domains (inhibitor and affinity clamp connected with linker1). Additionally, (H1A) binding peptide bound to the PDZ domain and connected to the affinity clamp on the other side with linker3

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
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]

Modeling

TRrosetta models this composite part with a score of 6 out of 6 according to our quality assessment code (you can find the python script file on the programming club page with further explanation of how you can optimize it to your needs).

                             Figure 1.  The 3D structure of switch 12 modeled by TRrosetta. Red: Tau binding peptides, 
                                              blue: H1A peptide, cyan: inhibitor and green: linkers
 

Docking

switch12 vs HtrA1 trimer:

ΔG = -22.315

                              Figure 2. The 3D structure of switch 12 docked to HtrA1