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Improved immobilization of fusion proteins via cellulose‐binding domains
Author(s) -
Linder Markus,
Nevanen Tarja,
Söderholm Lotta,
Bengs Outi,
Teeri Tuula T.
Publication year - 1998
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/(sici)1097-0290(19981205)60:5<642::aid-bit15>3.0.co;2-8
Subject(s) - cellulose , chemistry , fusion protein , fusion , biochemistry , computational biology , biophysics , biology , recombinant dna , gene , linguistics , philosophy
Cellulose‐binding domains (CBDs) are structurally and functionally independent, noncatalytic modules found in many cellulose or hemicellulose degrading enzymes. Recent biotechnological applications of the CBDs include facilitated protein immobilization on cellulose supports. In some occasions there have been concerns about the stability of the CBD driven immobilization. Here we have studied the chromatographic behavior of variants of the Trichoderma reesei cellobiohydrolase I CBD belonging to family I. Both CBDs fused to antibody fragments and isolated CBDs were studied and compared. Tritium labeling by reductive methylation was used as a sensitive detection method. The fusion protein as well as the isolated CBD was found to leak from the column at a rate of 0.3–0.5% of the immobilized protein per column volume. However, the leakage could be overcome by using two CBDs instead of a single CBD for the immobilization. In this way leakage was reduced to less than 0.01% per column volume. The improved immobilization could also be seen as a decreased migration of the protein down the column in extended washes. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 60: 642–647, 1998.