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Increased Solubility of Integrin βA Domain Using Maltose-Binding Protein as a Fusion Tag

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In proteomics research, generation of recombinant proteins in their native, soluble form with large quantity is often a challenging task. To tackle the expression difficulties, different expression vectors with distinct affinity fusion tags, i.e. pET-43.1a (N-utilization substance A tag), pMAL-cRI (maltose binding protein tag) (MBP tag), pGEX-4T-2 (glutathione S-transferase tag), and pET-15β (hexahistidine tag) were compared for their effects on the productivity and solubility, which were assessed by SDS-PAGE and immunoblotting, of the integrin βA domain. The incubation temperatures were tested for its effects on these parameters. Our data suggested that MBP tag enhanced the yield and solubility of the bA domain protein, which can also be recognized using an anti-CD18 antibody, at room temperature incubation. Thus, the nature of fusion partner chosen for expression in bacteria and its incubation temperature would significantly affect the yield and solubility of the recombinant target protein.

Keywords: Leukocyte integrin; maltose-binding protein; βA domain

Document Type: Research Article


Affiliations: Department of Surgery, The University of Hong Kong, Pokfulam, Hong Kong.

Publication date: May 1, 2006

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.

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