Abstract
Hemoglobin II from the clam L. pectinata is an O2 reactive protein that remains oxygenated in the presence of other molecules. To determine the mechanism of ligand selection in this hemoglobin, rHbII was expressed in large quantities using an improved fermentation process. The highest protein yield was obtained by: transforming HbII into the BLi5 cells, inducing and supplementing the culture during the mid-log phase with 1 mM IPTG, 30 μg/mL hemin chloride and 1% glucose, and decreasing the temperature to 30 °C after induction. In addition, cell culture density was greatly enhanced by using glycerol, adding MgSO4, supplementing the media with glucose after the glycerol was consumed and maintaining the dissolved oxygen at 35%. Under these conditions the maximum protein yield obtained was ~2,300 mg/L. The results indicate that rHbII is similar to the native protein. The protocol was validated with other hemoglobins, indicating that it can be extended to other hemeproteins.
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Abbreviations
- HbI, HbII, and HbIII:
-
Hemoglobins I, II and III
- rHbII:
-
Recombinant HbII
- nHbII:
-
Native HbII
- L. pectinata :
-
Lucina pectinata
- IPTG:
-
Isopropyl β-D-1-thiogalactopyranoside
- k on :
-
Association rate constant
- k off :
-
Dissociation rate constant
- Gln:
-
Glutamine
- Phe:
-
Phenylalanine
- Tyr:
-
Tyrosine
- RT-PCR:
-
Reverse transcription polymerase chain reaction
- TB:
-
Terrific broth
- E. coli :
-
Escherichia coli
- cDNA:
-
Complementary DNA
- OD:
-
Optical density
- dO2 :
-
Dissolved oxygen
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Acknowledgments
This work was supported in part by funds from the National Science Foundation, Cellular Biology (Grant 0544250), NIH-NIGMS/MBRS-SCORE S06GM08103-34 and NCRR RCMI grant G12RR03051. We thank Dr. Ruth G. Leon for the construction of the HbII pET-28a(+) vector. C. R. also thanks the Alfred P. Sloan (NACME) and CNY-PR AGEP for their fellowship support.
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Cacimar Ramos and Wilmarie Lorenzo contributed equally to this work.
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Ramos, C., Pietri, R., Lorenzo, W. et al. Recombinant Hemoglobin II From Lucina pectinata: A Large-Scale Method For Hemeprotein Expression in E. coli . Protein J 29, 143–151 (2010). https://doi.org/10.1007/s10930-010-9234-8
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DOI: https://doi.org/10.1007/s10930-010-9234-8