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Characterization of unusual truncated hemoglobins of Chlamydomonas reinhardtii suggests specialized functions

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Abstract

Main conclusion

Annotated hemoglobin genes in Chlamydomonas reinhardtii form functional globins, despite unusual architectures. Spectral characteristics show subtle biochemical differences. Multiple globins might help the alga to cope with its versatile environment.

The unicellular green alga C. reinhardtii is a photosynthetic, often soil-dwelling organism, subjected to a changeable environment in nature. The alga contains 12 genes encoding so-called truncated hemoglobins that feature a two-on-two helical fold instead of the three-on-three helix arrangement of the long-studied vertebrate globins or plant symbiotic and non-symbiotic hemoglobins. In plants, non-symbiotic hemoglobins often play a role in acclimation to stress, and we could show recently that one of the C. reinhardtii globin genes is vital for anoxic growth. Here, three further globin encoding transcripts (Cre16.g661000.t1.1, Cre16.g661300.t2.1 and Cre16.g662750.t1.2) were heterologously expressed along with the recently studied THB1. UV–Vis and X-ray absorption spectroscopy analyses show that the sequences indeed encode functional hemoglobins, despite their uncommon primary sequences, which include long C-termini without any predictable function, or a split heme-binding domain. The proteins show some variations regarding the coordination of the heme iron or the interaction with diatomic ligands, indicating different functionalities. The respective transcripts are not responsive to the nitrogen source, in contrast to results reported for THB1, but they accumulate in darkness. This work advances experimental data on the very large globin family in general, and, more specifically, on hemoglobins in photosynthetic organisms.

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Abbreviations

BVS:

Bond valence sum

DCMU:

3-(3,4-Dichlorophenyl)-1,1-dimethylurea

EXAFS:

Extended X-ray absorption fine structure

Hb:

Hemoglobin

2/2Hb:

Hemoglobin of the 2-on-2-helices fold (“truncated hemoglobin”)

3/3Hb:

Hemoglobin of the 3-on-3-helices (myoglobin-) fold

Mb:

Myoglobin

NOD:

Nitric oxide dioxygenase

qRT-PCR:

Quantitative reverse transcription polymerase chain reaction

RNA-Seq:

RNA sequencing

rTHB/rTHB-s:

Recombinant 2/2Hb/recombinant 2/2Hb lacking the C-terminus

XANES:

X-ray absorption near edge structure

XAS:

X-ray absorption spectroscopy

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Acknowledgments

We thank the Deutsche Forschungsgemeinschaft (DFG) for funding (He5790/1-1 and -2, and He5790/3-1 to A.H. and Ha3265/6-1 to M.H.). The work in Bochum was further supported by the Deutsches Zentrum für Luft- und Raumfahrt (DLR) (ModuLES). M.H. gratefully acknowledges the German Bundesministerium für Bildung und Forschung for funding within the Röntgen-Angström Cluster (Grant 05K14KE1), support within Unicat (Cluster of Excellence Berlin), and thanks the DFG for a Heisenberg Fellowship. We thank H. Dau (FU-Berlin) for access to XAS equipment at BESSY, F. Schäfers and M. Mertin for technical support at beamline KMC-1 of BESSY (HZB), and Simon Ernst, Siv Herbrig and Melis Düner for technical assistance at Bochum.

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Correspondence to Anja Hemschemeier.

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Huwald, D., Schrapers, P., Kositzki, R. et al. Characterization of unusual truncated hemoglobins of Chlamydomonas reinhardtii suggests specialized functions. Planta 242, 167–185 (2015). https://doi.org/10.1007/s00425-015-2294-4

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  • DOI: https://doi.org/10.1007/s00425-015-2294-4

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