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Morisada S, Ono Y, Kodaira T, Kishino H, Ninomiya R, Mori N, Watanabe H, Ohta A, Horiuchi H, Fukuda R. The membrane‐bound
O
‐acyltransferase Ale1 transfers an acyl moiety to newly synthesized 2‐alkyl‐
sn
‐glycero‐3‐phosphocholine in yeast. FEBS Lett 2018; 592:1829-1836. [DOI: 10.1002/1873-3468.13103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 05/10/2018] [Accepted: 05/11/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Shiho Morisada
- Department of Biotechnology The University of Tokyo Bunkyo‐ku Japan
| | - Yusuke Ono
- Department of Biotechnology The University of Tokyo Bunkyo‐ku Japan
| | - Teruhisa Kodaira
- Department of Applied Biological Chemistry The University of Tokyo Bunkyo‐ku Japan
| | - Hideyuki Kishino
- Department of Biotechnology The University of Tokyo Bunkyo‐ku Japan
| | - Ryo Ninomiya
- Department of Biotechnology The University of Tokyo Bunkyo‐ku Japan
| | - Naoki Mori
- Department of Applied Biological Chemistry The University of Tokyo Bunkyo‐ku Japan
| | - Hidenori Watanabe
- Department of Applied Biological Chemistry The University of Tokyo Bunkyo‐ku Japan
| | - Akinori Ohta
- Department of Biological Chemistry College of Bioscience and Biotechnology Chubu University Kasugai Japan
| | | | - Ryouichi Fukuda
- Department of Biotechnology The University of Tokyo Bunkyo‐ku Japan
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Tian S, Ohtsuka J, Wang S, Nagata K, Tanokura M, Ohta A, Horiuchi H, Fukuda R. Human CTP:phosphoethanolamine cytidylyltransferase: enzymatic properties and unequal catalytic roles of CTP-binding motifs in two cytidylyltransferase domains. Biochem Biophys Res Commun 2014; 449:26-31. [PMID: 24802409 DOI: 10.1016/j.bbrc.2014.04.131] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Accepted: 04/25/2014] [Indexed: 10/25/2022]
Abstract
CTP:phosphoethanolamine cytidylyltransferase (ECT) is a key enzyme in the CDP-ethanolamine branch of the Kennedy pathway, which is the primary pathway of phosphatidylethanolamine (PE) synthesis in mammalian cells. Here, the enzymatic properties of recombinant human ECT (hECT) were characterized. The catalytic reaction of hECT obeyed Michaelis-Menten kinetics with respect to both CTP and phosphoethanolamine. hECT is composed of two tandem cytidylyltransferase (CT) domains as ECTs of other organisms. The histidines, especially the first histidine, in the CTP-binding motif HxGH in the N-terminal CT domain were critical for its catalytic activity in vitro, while those in the C-terminal CT domain were not. Overexpression of the wild-type hECT and hECT mutants containing amino acid substitutions in the HxGH motif in the C-terminal CT domain suppressed the growth defect of the Saccharomyces cerevisiae mutant of ECT1 encoding ECT in the absence of a PE supply via the decarboxylation of phosphatidylserine, but overexpression of hECT mutants of the N-terminal CT domain did not. These results suggest that the N-terminal CT domain of hECT contributes to its catalytic reaction, but C-terminal CT domain does not.
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Affiliation(s)
- Siqi Tian
- Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Jun Ohtsuka
- Department of Applied Biological Chemistry, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Shipeng Wang
- Department of Applied Biological Chemistry, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Koji Nagata
- Department of Applied Biological Chemistry, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Masaru Tanokura
- Department of Applied Biological Chemistry, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Akinori Ohta
- Department of Biological Chemistry, College of Bioscience and Biotechnology, Chubu University, 1200 Matsumoto-cho, Kasugai, Aichi 487-8501, Japan
| | - Hiroyuki Horiuchi
- Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Ryouichi Fukuda
- Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
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Kishino H, Eguchi H, Takagi K, Horiuchi H, Fukuda R, Ohta A. Acyl-chain remodeling of dioctanoyl-phosphatidylcholine in Saccharomyces cerevisiae mutant defective in de novo and salvage phosphatidylcholine synthesis. Biochem Biophys Res Commun 2014; 445:289-93. [PMID: 24491568 DOI: 10.1016/j.bbrc.2014.01.136] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Accepted: 01/25/2014] [Indexed: 10/25/2022]
Abstract
A yeast strain, in which endogenous phosphatidylcholine (PC) synthesis is controllable, was constructed by the replacement of the promoter of PCT1, encoding CTP:phosphocholine cytidylyltransferase, with GAL1 promoter in a double deletion mutant of PEM1 and PEM2, encoding phosphatidylethanolamine methyltransferase and phospholipid methyltransferase, respectively. This mutant did not grow in the glucose-containing medium, but the addition of dioctanoyl-phosphatidylcholine (diC8PC) supported its growth. Analyses of the metabolism of (13)C-labeled diC8PC ((methyl-(13)C)3-diC8PC) in this strain using electrospray ionization tandem mass spectrometry revealed that it was converted to PC species containing acyl residues of 16 or 18 carbons at both sn-1 and sn-2 positions. In addition, both acyl residues of (methyl-(13)C)3-diC8PC were replaced with 16:1 acyl chains in the in vitro reaction using the yeast cell extract in the presence of palmitoleoyl-CoA. These results indicate that PC containing short acyl residues was remodeled to those with acyl chains of physiological length in yeast.
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Affiliation(s)
- Hideyuki Kishino
- Department of Biotechnology, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Hiroki Eguchi
- Department of Biotechnology, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Keiko Takagi
- Department of Biotechnology, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Hiroyuki Horiuchi
- Department of Biotechnology, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Ryouichi Fukuda
- Department of Biotechnology, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Akinori Ohta
- Department of Biotechnology, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.
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4
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Deng L, Fukuda R, Kakihara T, Narita K, Ohta A. Incorporation and remodeling of phosphatidylethanolamine containing short acyl residues in yeast. Biochim Biophys Acta Mol Cell Biol Lipids 2010; 1801:635-45. [PMID: 20176132 DOI: 10.1016/j.bbalip.2010.02.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2009] [Revised: 01/06/2010] [Accepted: 02/11/2010] [Indexed: 11/17/2022]
Abstract
Phosphatidylethanolamine (PE) is one of the essential phospholipids in the yeast Saccharomyces cerevisiae. We have previously shown that a yeast strain, the endogenous PE synthesis of which was controllable, grew in the presence of PE containing decanoyl residues (diC10PE) when PE synthesis was repressed. In this study, we investigated the fate of diC10PE, its uptake and remodeling in yeast. Deletion of the genes encoding Lem3p/Ros3p or P-type ATPases, Dnf1p and Dnf2p, impaired the growth of the mutants in the medium containing diC10PE, suggesting the involvement of these proteins in the uptake of diC10PE. Analysis of the metabolism of deuterium-labeled diC10PE by electrospray ionization tandem mass spectrometry revealed that it was rapidly converted to deuterium-labeled PEs containing C16 or C18 acyl residues. The probable intermediate PEs that contained decanoic acid and C16 or C18 fatty acids as acyl residues were also detected. In addition, a substantial amount of decanoic acid was released into the culture medium during growth in the presence of diC10PE. These results imply that diC10PE was remodeled to PEs with longer acyl residues and used as membrane components. Defects in the remodeling of diC10PE in the deletion mutants of ALE1 and SLC1, products of which were capable of acyl-transfer to the sn-2 position of lyso-phospholipids, suggested their involvement in the introduction of acyl residues to the sn-2 position of lyso-phosphatidylethanolamine in the remodeling reaction of diC10PE. Our results also suggest the presence of a mechanism to maintain the physiological length of PE acyl residues in yeast.
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Affiliation(s)
- Lan Deng
- Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
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Current awareness on yeast. Yeast 2008. [DOI: 10.1002/yea.1458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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