Unravelling the mechanism of pH-regulation in dinoflagellate luciferase.

Abstract:

:Dinoflagellates are the dominant source of bioluminescence in coastal waters. The luminescence reaction involves the oxidation of luciferin by a luciferase enzyme, which only takes place at low pH. The pH-dependence has previously been linked to four conserved histidines. It has been suggested that their protonation might induce a conformational change in the enzyme, thereby allowing substrate access to the binding pocket. Yet, the precise mechanism of luciferase activation has remained elusive. Here, we use computational tools to predict the open structure of the luciferase in Lingulodinium polyedra and to decipher the nature of the opening mechanism. Through accelerated molecular dynamics simulations, we demonstrate that the closed-open conformational change likely takes place via a tilt of the pH-regulatory helix-loop-helix domain. Moreover, we propose that the molecular basis for the transition is electrostatic repulsion between histidine-cation pairs, which destabilizes the closed conformation at low pH. Finally, by simulating truncated mutants, we show that eliminating the C-terminus alters the shape of the active site, effectively inactivating the luciferase.

journal_name

Int J Biol Macromol

authors

Kamerlin N,Delcey MG,Lindh R

doi

10.1016/j.ijbiomac.2020.08.071

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

2671-2680

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(20)34158-1

journal_volume

164

pub_type

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