NDLI: X-ray structure of methanol dehydrogenase from Paracoccus denitrificans and molecular modeling of its interactions with cytochrome c-551i

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X-ray structure of methanol dehydrogenase from Paracoccus denitrificans and molecular modeling of its interactions with cytochrome c-551i

Content Provider	Springer Nature Link
Author	Xia, Zong Xiang Dai, Wei Wen He, Yong Ning White, Scott A. Mathews, F. Scott Davidson, Victor L.
Copyright Year	2003
Abstract	The X-ray structure of methanol dehydrogenase (MEDH) from Paracoccus denitrificans (MEDH-PD) was determined at 2.5 Å resolution using molecular replacement based on the structure of MEDH from Methylophilus methylotrophus W3A1 (MEDH-WA). The overall structures from the two bacteria are similar to each other except that the former has a longer C-terminal tail in each subunit and shows local differences in several insertion regions. The "X-ray sequence" of the segment αGly444–αLeu452 was established, including one insertion and seven replacements compared with the reported sequence. The primary electron acceptor of MEDH-PD is cytochrome c-551i (Cytc551i). Based on the crystal structure of MEDH-PD and of the published structure of Cytc551i, their interactions were investigated by molecular modeling. As a guide and starting point, the covalently attached cytochrome and PQQ domains of the alcohol dehydrogenase from Pseudomonas putida HK5 (ADH2B) were used. In the modeling, two molecules of Cytc551i could be accommodated in their interaction with the MEDH heterotetramer in accordance with the two-fold molecular symmetry of the latter. Two models are proposed, in both of which electrostatic and hydrogen bonding interactions make major contributions to inter-protein binding. One of these models involves salt bridges from αArg99 of MEDH to the heme propionic acids of Cytc551i and the other involves salt bridges from αArg426 of MEDH to Glu112 of Cytc551i. Both involve salt bridges from αLys93 of MEDH to Asp75 of Cytc551i. The size and nature of the cytochrome/quinoprotein heterodimer interfaces and calculations of electronic coupling and electron transfer rates favor one of these models over the other.
Starting Page	843
Ending Page	854
Page Count	12
File Format	PDF
ISSN	09498257
Journal	JBIC Journal of Biological Inorganic Chemistry
Volume Number	8
Issue Number	8
e-ISSN	14321327
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-09-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electron transfer Pyrroloquinolinequinone Quinoprotein X-ray diffraction
Content Type	Text
Resource Type	Article
Subject	Biochemistry Inorganic Chemistry

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