Radioiodinated, photoactivatable phosphatidylcholine and phosphatidylserine

Transfer properties and differential photoreactive interaction with human erythrocyte membrane proteins

Alan J. Schroit, John Madsen, Arnold E. Ruoho

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Abstract

An isotopically labeled cross-linking reagent, succinimido 3-(3-[125I]iodo-4-azidophenyl)propionate, has been synthesized and coupled to 1-acyl-2-(aminocaproyl)phosphatidylcholine according to previously described procedures [Schroit, A. J., & Madsen, J. (1983) Biochemistry 22, 3617-3623]. 125I- and N3-labeled phosphatidylserine (125I-N3-PS) was produced from the phosphatidylcholine (PC) analogue by phospholipase D catalyzed base exchange in the presence of L-serine. These phospholipid analogues are photoactivatable, are labeled with 125I at high specific activity, completely incorporate into synthetic vesicles, and spontaneously transfer between membranes. When an excess of acceptor vesicles or red blood cells (RBC) was mixed with a population of donor vesicles containing the 125I-N3-phospholipids, approximately 40% of the analogues transferred to the acceptor population. After transfer in the dark to RBC, all of the 125I-N3-PC incorporated into the cells could be removed by washing with serum, whereas the 125I-N3-PS could not. After photolabeling of intact RBC, ∼50% of the PC and 20% of the PS cross-linked to membrane proteins as determined by their insolubility in CHCl3/MeOH. Analysis of probe distribution by sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed that 125I-N3-PS preferentially labeled a Mr 30 000 peptide which contained ∼30% of the protein-bound label.

Original languageEnglish (US)
Pages (from-to)1812-1819
Number of pages8
JournalBiochemistry
Volume26
Issue number7
StatePublished - 1987

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Phosphatidylserines
Erythrocyte Membrane
Phosphatidylcholines
Membrane Proteins
Blood
Erythrocytes
Phospholipids
Cross-Linking Reagents
Phospholipase D
Biochemistry
Propionates
Electrophoresis
Washing
Sodium Dodecyl Sulfate
Serine
Population
Labels
Polyacrylamide Gel Electrophoresis
Solubility
Cells

ASJC Scopus subject areas

  • Biochemistry

Cite this

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title = "Radioiodinated, photoactivatable phosphatidylcholine and phosphatidylserine: Transfer properties and differential photoreactive interaction with human erythrocyte membrane proteins",
abstract = "An isotopically labeled cross-linking reagent, succinimido 3-(3-[125I]iodo-4-azidophenyl)propionate, has been synthesized and coupled to 1-acyl-2-(aminocaproyl)phosphatidylcholine according to previously described procedures [Schroit, A. J., & Madsen, J. (1983) Biochemistry 22, 3617-3623]. 125I- and N3-labeled phosphatidylserine (125I-N3-PS) was produced from the phosphatidylcholine (PC) analogue by phospholipase D catalyzed base exchange in the presence of L-serine. These phospholipid analogues are photoactivatable, are labeled with 125I at high specific activity, completely incorporate into synthetic vesicles, and spontaneously transfer between membranes. When an excess of acceptor vesicles or red blood cells (RBC) was mixed with a population of donor vesicles containing the 125I-N3-phospholipids, approximately 40{\%} of the analogues transferred to the acceptor population. After transfer in the dark to RBC, all of the 125I-N3-PC incorporated into the cells could be removed by washing with serum, whereas the 125I-N3-PS could not. After photolabeling of intact RBC, ∼50{\%} of the PC and 20{\%} of the PS cross-linked to membrane proteins as determined by their insolubility in CHCl3/MeOH. Analysis of probe distribution by sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed that 125I-N3-PS preferentially labeled a Mr 30 000 peptide which contained ∼30{\%} of the protein-bound label.",
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T1 - Radioiodinated, photoactivatable phosphatidylcholine and phosphatidylserine

T2 - Transfer properties and differential photoreactive interaction with human erythrocyte membrane proteins

AU - Schroit, Alan J.

AU - Madsen, John

AU - Ruoho, Arnold E.

PY - 1987

Y1 - 1987

N2 - An isotopically labeled cross-linking reagent, succinimido 3-(3-[125I]iodo-4-azidophenyl)propionate, has been synthesized and coupled to 1-acyl-2-(aminocaproyl)phosphatidylcholine according to previously described procedures [Schroit, A. J., & Madsen, J. (1983) Biochemistry 22, 3617-3623]. 125I- and N3-labeled phosphatidylserine (125I-N3-PS) was produced from the phosphatidylcholine (PC) analogue by phospholipase D catalyzed base exchange in the presence of L-serine. These phospholipid analogues are photoactivatable, are labeled with 125I at high specific activity, completely incorporate into synthetic vesicles, and spontaneously transfer between membranes. When an excess of acceptor vesicles or red blood cells (RBC) was mixed with a population of donor vesicles containing the 125I-N3-phospholipids, approximately 40% of the analogues transferred to the acceptor population. After transfer in the dark to RBC, all of the 125I-N3-PC incorporated into the cells could be removed by washing with serum, whereas the 125I-N3-PS could not. After photolabeling of intact RBC, ∼50% of the PC and 20% of the PS cross-linked to membrane proteins as determined by their insolubility in CHCl3/MeOH. Analysis of probe distribution by sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed that 125I-N3-PS preferentially labeled a Mr 30 000 peptide which contained ∼30% of the protein-bound label.

AB - An isotopically labeled cross-linking reagent, succinimido 3-(3-[125I]iodo-4-azidophenyl)propionate, has been synthesized and coupled to 1-acyl-2-(aminocaproyl)phosphatidylcholine according to previously described procedures [Schroit, A. J., & Madsen, J. (1983) Biochemistry 22, 3617-3623]. 125I- and N3-labeled phosphatidylserine (125I-N3-PS) was produced from the phosphatidylcholine (PC) analogue by phospholipase D catalyzed base exchange in the presence of L-serine. These phospholipid analogues are photoactivatable, are labeled with 125I at high specific activity, completely incorporate into synthetic vesicles, and spontaneously transfer between membranes. When an excess of acceptor vesicles or red blood cells (RBC) was mixed with a population of donor vesicles containing the 125I-N3-phospholipids, approximately 40% of the analogues transferred to the acceptor population. After transfer in the dark to RBC, all of the 125I-N3-PC incorporated into the cells could be removed by washing with serum, whereas the 125I-N3-PS could not. After photolabeling of intact RBC, ∼50% of the PC and 20% of the PS cross-linked to membrane proteins as determined by their insolubility in CHCl3/MeOH. Analysis of probe distribution by sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed that 125I-N3-PS preferentially labeled a Mr 30 000 peptide which contained ∼30% of the protein-bound label.

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