Related Experiment Videos
Engineering trimeric fibrous proteins based on bacteriophage T4 adhesins
K A Miroshnikov1, E I Marusich, M E Cerritelli
1Howard Hughes Medical Institute, Bach Institute of Biochemistry, Moscow, Russia.
Protein Engineering
|July 29, 1998
Summary
Bacteriophage T4 tail-fiber assembly, usually needing viral chaperones, can be achieved by fusing gene 12 or 37 fragments to fibritin. This bypasses the need for gp57A and gp38 chaperones, enabling correct protein folding and oligomerization.
Area of Science:
- Structural biology
- Molecular biology
- Virology
Background:
- Bacteriophage T4 tail fibers, essential for host adsorption, are assembled via specific genes.
- Genes 12 and 37 encode short tail fibers (STF) and long tail fibers (LTF), respectively, which are trimeric proteins.
- Assembly of these tail fibers typically requires viral chaperones gp57A and gp38.
Purpose of the Study:
- To investigate if fusing tail fiber gene fragments to fibritin can facilitate assembly without chaperones.
- To determine if such chimeras can achieve correct protein folding and oligomerization.
Main Methods:
- Genetic engineering to create chimeric proteins by fusing fragments of gp12 and gp37 to fibritin E.
- Expression of chimeric proteins from plasmids.
- Biochemical analysis to assess protein solubility, SDS resistance, and trypsin resistance.
Main Results:
- Three chimeric proteins were successfully constructed and expressed.
- All expressed chimeras formed soluble trimers.
- The chimeras demonstrated resistance to SDS dissociation and trypsin digestion, indicating correct folding and stable oligomerization.
Conclusions:
- Fusing bacteriophage T4 tail fiber gene fragments (gp12, gp37) to fibritin can bypass the requirement for viral chaperones (gp57A, gp38) in assembly.
- This strategy leads to the formation of correctly folded and oligomerized chimeric proteins.
- The findings offer a novel approach to studying and potentially manipulating bacteriophage tail fiber assembly.