Libraries of hybrid proteins from distantly related sequences
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Updated: Oct 7, 2026

An Integrated Approach for Microprotein Identification and Sequence Analysis
Published on: July 12, 2022
V Sieber1, C A Martinez, F H Arnold
1Division of Chemistry and Chemical Engineering 210-41, California Institute of Technology, Pasadena CA 91105, USA.
Abstract:
We introduce a method for sequence homology-independent protein recombination (SHIPREC) that can create libraries of single-crossover hybrids of unrelated or distantly related proteins. The method maintains the proper sequence alignment between the parents and introduces crossovers mainly at structurally related sites distributed over the aligned sequences. We used SHIPREC to create a library of interspecies hybrids of a membrane-associated human cytochrome P450 (1A2) and the heme domain of a soluble bacterial P450 (BM3). By fusing the hybrid gene library to the gene for chloramphenicol acetyl transferase (CAT), we were able to select for soluble and properly folded protein variants. Screening for 1A2 activity (deethylation of 7-ethoxyresorufin) identified two functional P450 hybrids that were more soluble in the bacterial cytoplasm than the wild-type 1A2 enzyme.
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