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Effects of phospholipid headgroup and phase on the activity of diacylglycerol kinase of Escherichia coli

Effects of phospholipid headgroup and phase on the activity of diacylglycerol kinase of Escherichia coli
Effects of phospholipid headgroup and phase on the activity of diacylglycerol kinase of Escherichia coli
Diacylglycerol kinase (DGK) of Escherichia coli has been reconstituted into a variety of phospholipid bilayers and its activity determined as a function of lipid headgroup structure and phase preference. The anionic phospholipids dioleoylphosphatidic acid, dioleoylphosphatidylserine, and cardiolipin were all found to support activities lower than that supported by dioleoylphosphatidylcholine. In mixtures of dioleoylphosphatidylcholine and 20 mol % anionic phospholipids, the presence of anionic phospholipids all resulted in lower activities than in dioleoylphosphatidylcholine, except for dioleoylphosphatidylglycerol whose presence had little effect on activity. In some cases, the low activity in the presence of anionic phospholipid followed from a decrease in vmax; in some cases, it followed from an increase in the Km for diacylglycerol, and in the case of dioleoylphosphatidic acid, it followed from both. Activities in mixtures containing 80 mol % dioleoylphosphatidylethanolamine were lower than in dioleoylphosphatidylcholine at temperatures where both lipids adopted a bilayer phase; at higher temperatures where dioleoylphosphatidylethanolamine preferred a hexagonal HII phase, the differences in activity were greater. These experiments suggest that the presence of lipids preferring a hexagonal HII phase leads to low activities. Activities of DGK are low in a gel phase lipid.
0006-2960
14891-14897
Pilot, Jeffrey D.
f234de19-b101-4177-b14a-446c9621c932
East, J. Malcolm
9fe7f794-1d89-4935-9a99-b831d786056e
Lee, Anthony G.
0891914c-e0e2-4ee1-b43e-1b70eb072d8e
Pilot, Jeffrey D.
f234de19-b101-4177-b14a-446c9621c932
East, J. Malcolm
9fe7f794-1d89-4935-9a99-b831d786056e
Lee, Anthony G.
0891914c-e0e2-4ee1-b43e-1b70eb072d8e

Pilot, Jeffrey D., East, J. Malcolm and Lee, Anthony G. (2001) Effects of phospholipid headgroup and phase on the activity of diacylglycerol kinase of Escherichia coli. Biochemistry, 40 (49), 14891-14897. (doi:10.1021/bi011333r).

Record type: Article

Abstract

Diacylglycerol kinase (DGK) of Escherichia coli has been reconstituted into a variety of phospholipid bilayers and its activity determined as a function of lipid headgroup structure and phase preference. The anionic phospholipids dioleoylphosphatidic acid, dioleoylphosphatidylserine, and cardiolipin were all found to support activities lower than that supported by dioleoylphosphatidylcholine. In mixtures of dioleoylphosphatidylcholine and 20 mol % anionic phospholipids, the presence of anionic phospholipids all resulted in lower activities than in dioleoylphosphatidylcholine, except for dioleoylphosphatidylglycerol whose presence had little effect on activity. In some cases, the low activity in the presence of anionic phospholipid followed from a decrease in vmax; in some cases, it followed from an increase in the Km for diacylglycerol, and in the case of dioleoylphosphatidic acid, it followed from both. Activities in mixtures containing 80 mol % dioleoylphosphatidylethanolamine were lower than in dioleoylphosphatidylcholine at temperatures where both lipids adopted a bilayer phase; at higher temperatures where dioleoylphosphatidylethanolamine preferred a hexagonal HII phase, the differences in activity were greater. These experiments suggest that the presence of lipids preferring a hexagonal HII phase leads to low activities. Activities of DGK are low in a gel phase lipid.

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Submitted date: 26 June 2001
Published date: 11 December 2001

Identifiers

Local EPrints ID: 56590
URI: http://eprints.soton.ac.uk/id/eprint/56590
ISSN: 0006-2960
PURE UUID: 2eeddf4c-bf7c-4875-a291-ba7ce1de6040

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Date deposited: 07 Aug 2008
Last modified: 15 Mar 2024 11:02

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Contributors

Author: Jeffrey D. Pilot
Author: J. Malcolm East
Author: Anthony G. Lee

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