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Title: Elevated Expression of a Functional Suf Pathway in Escherichia coli BL21(DE3) Enhances Recombinant Production of an Iron-Sulfur Cluster-Containing Protein

Journal Article · · Journal of Bacteriology
 [1];  [2];  [2];  [3];  [4]
  1. Marquette Univ., Milwaukee, WI (United States); Saint Louis University
  2. Univ. of Wisconsin, Madison, WI (United States)
  3. Marquette Univ., Milwaukee, WI (United States); Saint Louis Univ. School of Medicine, MO (United States)
  4. Univ. of Illinois at Urbana-Champaign, IL (United States)

Structural and spectroscopic analysis of iron-sulfur [Fe-S] cluster-containing proteins is often limited by the occupancy and yield of recombinantly produced proteins. In this work, we report that Escherichia coli BL21(DE3), a strain routinely used to overproduce [Fe-S] cluster-containing proteins, has a nonfunctional Suf pathway, one of two E. coli [Fe-S] cluster biogenesis pathways. We confirmed that BL21(DE3) and commercially available derivatives carry a deletion that results in an in-frame fusion of sufA and sufB genes within the sufABCDSE operon. We show that this fusion protein accumulates in cells but is inactive in [Fe-S] cluster biogenesis. Restoration of an intact Suf pathway combined with enhanced suf operon expression led to a remarkable (~3-fold) increase in the production of the [4Fe-4S] cluster-containing BchL protein, a key component of the dark-operative protochlorophyllide oxidoreductase complex. These results show that this engineered “SufFeScient” derivative of BL21(DE3) is suitable for enhanced large-scale synthesis of an [Fe-S] cluster-containing protein.

Research Organization:
Marquette Univ., Milwaukee, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0017866
OSTI ID:
1593945
Journal Information:
Journal of Bacteriology, Journal Name: Journal of Bacteriology Journal Issue: 3 Vol. 202; ISSN 0021-9193
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English

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