title: Enhancement of mussel adhesive protein production in Escherichia coli by co-expression of bacterial hemoglobin.
abstract: Mussel adhesive proteins (MAPs) have been considered as potential underwater and medical bioadhesives. Previously, we reported a functional expression of recombinant MAP hybrid fp-151, which is a fusion protein with six type 1 (fp-1) decapeptide repeats at each type 5 (fp-5) terminus, with practical properties in Escherichia coli. In the present work, we introduced the Vitreoscilla hemoglobin (VHb) co-expression strategy to enhance the production levels of hybrid fp-151 since VHb has been successfully used for efficient oxygen utilization in several expression systems, including E. coli. In both batch-type flask and fed-batch-type bioreactor cultures, we found that co-expression of VHb conferred higher cell growth and hybrid fp-151 production. Its positive effects were significantly increased in high cell density bioreactor cultures as the microaerobic environment was more quickly and severely formed. We obtained a approximately 1.9-fold higher (approximately 1 g/L) production of MAP fp-151 from VHb co-expressing cells in fed-batch bioreactor cultures as compared to that from VHb non-expressing cells. Collectively and regardless of the culture type, VHb co-expression strategy was successful in enhancing the production of recombinant mussel adhesive proteins in the E. coli expression system.
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Doil
authors.initials: D
authors.lastname: Kim
authors.forename: Dong Soo
authors.initials: DS
authors.lastname: Hwang
authors.forename: Dong Gyun
authors.initials: DG
authors.lastname: Kang
authors.forename: Jaoon Y H
authors.initials: JY
authors.lastname: Kim
authors.forename: Hyung Joon
authors.initials: HJ
authors.lastname: Cha
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D024861:Genetic Enhancement / Q000379:methods*; D015202:Protein Engineering / Q000379:methods*; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D054793:Truncated Hemoglobins / Q000235:genetics / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D011506:Proteins; D011993:Recombinant Fusion Proteins; D054793:Truncated Hemoglobins; C037403:adhesive protein, mussel; C082613:hemoglobin protein, Vitreoscilla