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Absorption and fluorescence characteristics of photo-activated adenylate cyclase nano-clusters from the amoeboflagellate Naegleria gruberi NEG-M strain |
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| Authors: | A. Penzkofer M. StierlP. Hegemann S. Kateriya |
| Affiliation: | a Fakultät für Physik, Universität Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany b Institut für Biologie/Experimentelle Biophysik, Humboldt Universität zu Berlin, Invalidenstrasse 42, D-10115 Berlin, Germany c Department of Biochemistry, University of Delhi South Campus, Benito Juarez Road, New Delhi 110021, India |
| Abstract: | The spectroscopic characteristics of BLUF (BLUF = sensor of blue light using flavin) domain containing soluble adenylate cyclase (nPAC = Naegleria photo-activated cyclase) samples from the amoeboflagellate Naegleria gruberi NEG-M strain is studied at room temperature. The absorption and fluorescence spectroscopic development in the dark was investigated over two weeks. Attenuation coefficient spectra, fluorescence quantum distributions, fluorescence quantum yields, and fluorescence excitation distributions were measured. Thawing of frozen nPAC samples gave solutions with varying protein nano-cluster size and varying flavin, tyrosine, tryptophan, and protein color-center emission. Protein color-center emission was observed in the wavelength range of 360-900 nm with narrow emission bands of small Stokes shift and broad emission bands of large Stokes shift. The emission spectra evolved in time with protein nano-cluster aging. |
| Keywords: | Photo-activated adenylate cyclase BLUF domain Amoeboflagellate Naegleria gruberi Flavin Tyrosine Tryptophan Color center emission Protein aging Fluorescence quantum distributions Fluorescence excitation spectra Fluorescence quantum yields |
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