1. Purification of His6-tagged Photosystem I from Chlamydomonas reinhardtii.
- Author
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Galina Gulis, Kuppala Narasimhulu, and Lisa Fox
- Abstract
Abstract  We have developed a rapid method for isolation of the Photosystem I (PS1) complex from Chlamydomonas reinhardtii using epitope tagging. Six histidine residues were genetically added to the N-terminus of the PsaA core subunit of PS1. The His6-tagged PS1 could be purified with a yield of 80â90% from detergent-solubilized thylakoid membranes within 3 h in a single step using a Ni-nitrilotriacetic acid (Ni-NTA) column. Immunoblots and low-temperature fluorescence analysis indicated that the His6-tagged PS1 preparation was highly pure and extremely low in uncoupled pigments. Moreover, the introduced tag appeared to have no adverse effect upon PS1 structure/function, as judged by photochemical assays and EPR spectroscopy of isolated particles, as well as photosynthetic growth tests of the tagged strain. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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