5ZBF

Crystal structure of 4-hydroxyphenylpyruvic acid bound AerE from Microcystis aeruginosa

Summary for 5ZBF

• Entry DOI: 10.2210/pdb5zbf/pdb
• Descriptor: Cupin domain protein, 3-(4-HYDROXY-PHENYL)PYRUVIC ACID, FE (II) ION, ... (4 entities in total)
• Functional Keywords: microcystis aeruginosa, choi moiety of aeruginosins, cupin superfamily enzyme, isomerase
• Biological source: Microcystis aeruginosa DIANCHI905
• Total number of polymer chains: 1
• Total formula weight: 24772.10

Authors

Qiu, X.,Zhu, W. (deposition date: 2018-02-11, release date: 2019-02-13, Last modification date: 2024-03-27)

Primary citation

Qiu, X.,Zhu, W.,Wang, W.,Jin, H.,Zhu, P.,Zhuang, R.,Yan, X.
Structural and functional insights into the role of a cupin superfamily isomerase in the biosynthesis of Choi moiety of aeruginosin.
J. Struct. Biol., 205:44-52, 2019

PubMed Abstract: The 2-carboxy-6-hydroxyoctahydroindole (Choi) moiety is a hallmark of aeruginosins, a class of cyanobacterial derived bioactive linear tetrapeptides that possess antithrombotic activity. The biosynthetic pathway of Choi has yet to be resolved. AerE is a cupin superfamily enzyme that was shown to be involved in the biosynthesis of Choi, but its exact role remains unclear. This study reports the functional characterization and structural analyses of AerE. Enzymatic observation reveals that AerE can dramatically accelerate 1,3-allylic isomerization of the non-aromatic decarboxylation product of prephenate, dihydro-4-hydroxyphenylpyruvate (HHPP). This olefin isomerization reaction can occur non-enzymatically and is the second step of the biosynthetic pathway from prephenate to Choi. The results of comparative structural analysis and substrate analogue binding geometry analysis combined with the results of mutational studies suggest that AerE employs an induced fit strategy to bind and stabilize the substrate in a particular conformation that is possibly favorable for 1,3-allylic isomerization of HHPP through coordinate bonds, hydrogen bonds, π-π conjugation interaction and hydrophobic interactions. All of these interactions are critical for the catalytic efficiency.

PubMed: 30742895
DOI: 10.1016/j.jsb.2019.01.007

Experimental method

X-RAY DIFFRACTION (1.6 Å)