Abstract
A poly-Lys tag was fused to the Lucina pectinata hemoglobin I (HbI) coding sequence and purified using an efficient and fast process. HbI is a hemeprotein that binds hydrogen sulfide (H2S) with high affinity and it has been used to understand physiologically relevant reactions of this signaling molecule. The (Lys)6-tagged rHbI construct was expressed in E. coli and purified by immobilization on a cation exchange matrix, followed by size-exclusion chromatography. The identity, structure, and function of the (Lys)6-tagged rHbI were assessed by mass spectrometry, small and wide X-ray scattering, optical spectroscopy, and kinetic analysis. The scattering and spectroscopic results showed that the (Lys)6-tagged rHbI is structurally and functionally analogous to the native protein as well as to the (His)6-tagged rHbI. Kinetics studies with H2S indicated that the association (k on) and dissociation (k off) rate constants were 1.4 × 105/M/s and 0.1 × 10−3/s, respectively. This results confirmed that the (Lys)6-tagged rHbI binds H2S with the same high affinity as its homologue.
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Acknowledgments
We are most grateful to Prof. Rafael A. Estremera-Andújar for the helpful discussion in the protein purification process, Ms. Ingrid M. Montes-Rodríguez, Mrs. Jessicca Renta, and Dr. José Casanovas-Nieves for their assistance in the molecular cloning analysis as well as undergraduate students Jay J. Rivera Romero and Ruth Martell. The investigators are most grateful to the assistance of Dr. Ariel Lewis-Ballester and Dr. Syun-Ru Yeh for the use of Stopped Flow equipment for kinetic analysis. The support of the RISE 2BEST Program (NIH-RISE NIGMS grant number R25GM088023, RDA), MARC USTAR Program (5T34GM008419-23), the IGERT Nanomedicine Doctoral Fellowship and the Alfred P. Sloan program is deeply appreciated. This project was supported in part by grants from the National Science Foundation (Grant 0843608, JLG), the National Institutes of Health: National Center for Research Resources (G12-RR003051), the National Institute on Minority Health and Health Disparities (G12-MD007600) and Advancing Competitive Biomedical Research in Puerto Rico (P20GM103475).
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Díaz-Ayala, R., Moya-Rodríguez, A., Pietri, R. et al. Molecular Cloning and Characterization of a (Lys)6-Tagged Sulfide-Reactive Hemoglobin I from Lucina pectinata . Mol Biotechnol 57, 1050–1062 (2015). https://doi.org/10.1007/s12033-015-9896-8
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DOI: https://doi.org/10.1007/s12033-015-9896-8