NDLI: Crystal Structures of Ethanolamine Ammonia-lyase Complexed with Coenzyme B12 Analogs and Substrates

Content Provider	Journal of Biological Chemistry (JBC)
Author	Shibata, Naoki Tamagaki, Hiroko Hieda, Naoki Akita, Keita Komori, Hirofumi Shomura, Yasuhito Terawaki, Shin-ichi Mori, Koichi Yasuoka, Noritake Higuchi, Yoshiki Toraya, Tetsuo
Abstract	N-terminal truncation of the Escherichia coli ethanolamine ammonia-lyase β-subunit does not affect the catalytic properties of the enzyme (Akita, K., Hieda, N., Baba, N., Kawaguchi, S., Sakamoto, H., Nakanishi, Y., Yamanishi, M., Mori, K., and Toraya, T. (2010) J. Biochem. 147, 83–93). The binary complex of the truncated enzyme with cyanocobalamin and the ternary complex with cyanocobalamin or adeninylpentylcobalamin and substrates were crystallized, and their x-ray structures were analyzed. The enzyme exists as a trimer of the (αβ)2 dimer. The active site is in the (β/α)8 barrel of the α-subunit; the β-subunit covers the lower part of the cobalamin that is bound in the interface of the α- and β-subunits. The structure complexed with adeninylpentylcobalamin revealed the presence of an adenine ring-binding pocket in the enzyme that accommodates the adenine moiety through a hydrogen bond network. The substrate is bound by six hydrogen bonds with active-site residues. Argα160 contributes to substrate binding most likely by hydrogen bonding with the O1 atom. The modeling study implies that marked angular strains and tensile forces induced by tight enzyme-coenzyme interactions are responsible for breaking the coenzyme Co–C bond. The coenzyme adenosyl radical in the productive conformation was modeled by superimposing its adenine ring on the adenine ring-binding site followed by ribosyl rotation around the N-glycosidic bond. A major structural change upon substrate binding was not observed with this particular enzyme. Gluα287, one of the substrate-binding residues, has a direct contact with the ribose group of the modeled adenosylcobalamin, which may contribute to the substrate-induced additional labilization of the Co–C bond.
Related Links	http://www.jbc.org/content/285/34/26484.abstract
Ending Page	26493
Starting Page	26484
Page Count	10
File Format	HTM / HTML PDF
ISSN	00219258
Journal	Journal of Biological Chemistry (JBC)
Issue Number	34
Volume Number	285
DOI	10.1074/jbc.M110.125112
e-ISSN	1083351X
Language	English
Publisher	American Society for Biochemistry and Molecular Biology
Publisher Date	2010-08-20
Access Restriction	Open
Subject Keyword	Adenosylcobalamin Enzyme Catalysis Enzyme Structure Vitamin B X-ray Crystallography Ethanolamine Ammonia-lyase Enzymology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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Crystal Structures of Ethanolamine Ammonia-lyase Complexed with Coenzyme B12 Analogs and Substrates*

Crystal structure of ethanolamine ammonia-lyase complexed with coenzyme B12 analog Adeninylpentylcobalamin and substrate

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Crystal Structures of Ethanolamine Ammonia-lyase Complexed with Coenzyme B12 Analogs and Substrates

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