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Resolving domain positions of cellobiose dehydrogenase by small angle X–ray scattering

Journal Article · · Federation of European Biochemical Societies (FEBS) Journal
DOI:https://doi.org/10.1111/febs.16885· OSTI ID:2473029
 [1];  [2];  [3];  [4];  [2]
  1. Univ. of Natural Resources and Life Sciences, Vienna (Austria); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  2. Univ. of Natural Resources and Life Sciences, Vienna (Austria)
  3. Univ. of Natural Resources and Life Sciences, Vienna (Austria); Medical University of Graz (Austria)
  4. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
The interdomain electron transfer (IET) between the catalytic flavodehydrogenase domain and the electron-transferring cytochrome domain of cellobiose dehydrogenase (CDH) plays an essential role in biocatalysis, biosensors and biofuel cells, as well as in its natural function as an auxiliary enzyme of lytic polysaccharide monooxygenase. We investigated the mobility of the cytochrome and dehydrogenase domains of CDH, which is hypothesised to limit IET in solution by small angle X-ray scattering (SAXS). CDH from Myriococcum thermophilum (syn. Crassicarpon hotsonii, syn. Thermothelomyces myriococcoides) was probed by SAXS to study the CDH mobility at different pH and in the presence of divalent cations. By comparison of the experimental SAXS data, using pair-distance distribution functions and Kratky plots, we show an increase in CDH mobility at higher pH, indicating alterations of domain mobility. To further visualise CDH movement in solution, we performed SAXS-based multistate modelling. Glycan structures present on CDH partially masked the resulting SAXS shapes, we diminished these effects by deglycosylation and studied the effect of glycoforms by modelling. The modelling shows that with increasing pH, the cytochrome domain adopts a more flexible state with significant separation from the dehydrogenase domain. On the contrary, the presence of calcium ions decreases the mobility of the cytochrome domain. Experimental SAXS data, multistate modelling and previously reported kinetic data show how pH and divalent ions impact the closed state necessary for the IET governed by the movement of the CDH cytochrome domain.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
Austrian Science Fund (FWF); National Cancer Institute (NCI); National Institute of General Medical Sciences (NIGMS); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2473029
Journal Information:
Federation of European Biochemical Societies (FEBS) Journal, Journal Name: Federation of European Biochemical Societies (FEBS) Journal Journal Issue: 19 Vol. 290; ISSN 1742-464X
Publisher:
Federation of European Biochemical SocietiesCopyright Statement
Country of Publication:
United States
Language:
English

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