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Kinetic basis for linking the first two enzymes of chlorophyll biosynthesis

Shepherd, Mark, McLean, Samantha, Hunter, C. Neil (2005) Kinetic basis for linking the first two enzymes of chlorophyll biosynthesis. FEBS Journal, 272 (17). pp. 4532-4539. ISSN 1742-464X. (doi:10.1111/j.1742-4658.2005.04873.x) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:28095)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided.
Official URL:
http://dx.doi.org/10.1111/j.1742-4658.2005.04873.x

Abstract

Purified recombinant proteins from Synechocystis PCC6803 were used to show that the magnesium chelatase ChlH subunit stimulates magnesium protoporphyrin methyltransferase (ChlM) activity. Steady-state kinetics demonstrate that ChlH does not significantly alter the K(m) for the tetrapyrrole substrate. However, quenched-flow analysis reveals that ChlH dramatically accelerates the formation and breakdown of an intermediate in the catalytic cycle of ChlM. In light of the profound effect that ChlH has on the methyltransferase catalytic intermediate, the pre steady-state analysis in the current study suggests that ChlH is directly involved in the reaction chemistry. The kinetic coupling between the chelatase and methyltransferase has important implications for regulation of chlorophyll biosynthesis and for the availability of magnesium protoporphyrin for plastid-to-nucleus signalling.

Item Type: Article
DOI/Identification number: 10.1111/j.1742-4658.2005.04873.x
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > Biosciences
Depositing User: Mark Shepherd
Date Deposited: 01 Sep 2011 16:06 UTC
Last Modified: 16 Nov 2021 10:06 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/28095 (The current URI for this page, for reference purposes)

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