4p1q
From Proteopedia
GREEN FLUORESCENT PROTEIN E222H VARIANT
Structural highlights
FunctionGFP_AEQVI Energy-transfer acceptor. Its role is to transduce the blue chemiluminescence of the protein aequorin into green fluorescent light by energy transfer. Fluoresces in vivo upon receiving energy from the Ca(2+)-activated photoprotein aequorin. Publication Abstract from PubMedThe widely used green fluorescent protein (GFP) decarboxylates upon irradiation; this involves removal of the acidic function of the glutamic acid at position 222, thereby resulting in the irreversible photoconversion of GFP. To suppress this phenomenon, the photostable, non-photoconvertible histidine was introduced at position 222 in GFP. The variant E222H shows negligible photodynamic processes and high expression yield. In addition, the stable and bright fluorescence over a wide pH range makes the E222H protein an alternative for GFP in fluorescence imaging and spectroscopy. Other fluorescent proteins are predicted to benefit from replacement of the catalytic glutamic acid by histidine. Replacement of Highly Conserved E222 by the Photostable Non-photoconvertible Histidine in GFP.,Auerbach D, Klein M, Franz S, Carius Y, Lancaster CR, Jung G Chembiochem. 2014 Jul 7;15(10):1404-8. doi: 10.1002/cbic.201402075. Epub 2014 Jun, 11. PMID:24919579[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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