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Ancestral mutations as a tool for solubilizing proteins: The case of a hydrophobic phosphate-binding protein

Gonzalez, D
; 
Hiblot, J
; 
Darbinian, N
; 
Miller, JC
; 
Gotthard, G
; 
Amini, S
; 
Chabriere, E
; 
Elias, M
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Journal Article
Date
2014-01-01
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Subject
Ancestral librairies
 Protein engineering
 Protein solubilization
 Hydrophobic proteins
 Phosphate-binding proteins
 DING proteins
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http://hdl.handle.net/20.500.12613/5344
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Ancestral mutations as a tool for solubilizing proteins The case of a hydrophobic phosphate-binding protein.pdf
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DOI
10.1016/j.fob.2013.12.006
Abstract
Stable and soluble proteins are ideal candidates for functional and structural studies. Unfortunately, some proteins or enzymes can be difficult to isolate, being sometimes poorly expressed in heterologous systems, insoluble and/or unstable. Numerous methods have been developed to address these issues, from the screening of various expression systems to the modification of the target protein itself. Here we use a hydrophobic, aggregation-prone, phosphate-binding protein (HPBP) as a case study. We describe a simple and fast method that selectively uses ancestral mutations to generate a soluble, stable and functional variant of the target protein, here named sHPBP. This variant is highly expressed in Escherichia coli, is easily purified and its structure was solved at much higher resolution than its wild-type progenitor (1.3 versus 1.9Å, respectively). © 2014 The Authors.
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Wiley
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