Site-directed mutagenesis and expression of PC2 in microinjected Xenopus oocytes

K I Shennan, A J Seal, S P Smeekens, D F Steiner, K Docherty

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The biosynthesis and post-translational maturation of PC2, a neuroendocrine-specific Kex2-like endoprotease, following expression in Xenopus oocytes is described. The initial translation product was a 75-kDa membrane-associated protein which was released from the oocytes as a glycosylated 71-kDa protein. During extended chase periods, the extracellular 71-kDa protein was converted to a mature 68-kDa product. A deletion mutant lacking a putative COOH-terminal amphipathic helix was still membrane-associated, suggesting that this domain was not essential for attachment of PC2 to membranes. Two putative proregion cleavage site mutants were also constructed. Conversion of the 75-kDa peptide to the 71-kDa peptide involved cleavage at the sequence Lys-Arg-Arg-Arg (amino acids 78-81), since mutation of this sequence to Lys-Val-Arg-Leu resulted in the secretion of the 75-kDa peptide. Extracellular conversion of the 71-kDa peptide to the 68-kDa peptide involved cleavage at the sequence Arg-Lys-Lys-Arg (amino acids 106-109), since deletion of this tetrabasic sequence resulted in secretion of the 71-kDa peptide without further conversion to the 68-kDa form. Finally, a mutation which changed a catalytically important Asp to Asn did not affect processing of proPC2. These results may be relevant to our understanding of mechanisms in the intracellular sorting and maturation of proPC2 in neuroendocrine cells.
Original languageEnglish
Pages (from-to)24011-7
Number of pages7
JournalThe Journal of Biological Chemistry
Volume266
Issue number35
Publication statusPublished - 15 Dec 1991

Fingerprint

Mutagenesis
Xenopus
Site-Directed Mutagenesis
Oocytes
Peptides
Membranes
Amino Acids
Neuroendocrine Cells
Mutation
Sequence Deletion
Biosynthesis
Sorting
Membrane Proteins
Proteins
Processing

Keywords

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Cell Membrane
  • Enzyme Precursors
  • Kinetics
  • Microinjections
  • Molecular Sequence Data
  • Mutagenesis, Site-Directed
  • Oligodeoxyribonucleotides
  • Oocytes
  • Plasmids
  • Proprotein Convertase 2
  • Protease Inhibitors
  • Protein Biosynthesis
  • Protein Processing, Post-Translational
  • RNA, Messenger
  • Restriction Mapping
  • Serine Endopeptidases
  • Transcription, Genetic
  • Xenopus laevis

Cite this

Shennan, K. I., Seal, A. J., Smeekens, S. P., Steiner, D. F., & Docherty, K. (1991). Site-directed mutagenesis and expression of PC2 in microinjected Xenopus oocytes. The Journal of Biological Chemistry, 266(35), 24011-7.

Site-directed mutagenesis and expression of PC2 in microinjected Xenopus oocytes. / Shennan, K I; Seal, A J; Smeekens, S P; Steiner, D F; Docherty, K.

In: The Journal of Biological Chemistry, Vol. 266, No. 35, 15.12.1991, p. 24011-7.

Research output: Contribution to journalArticle

Shennan, KI, Seal, AJ, Smeekens, SP, Steiner, DF & Docherty, K 1991, 'Site-directed mutagenesis and expression of PC2 in microinjected Xenopus oocytes', The Journal of Biological Chemistry, vol. 266, no. 35, pp. 24011-7.
Shennan, K I ; Seal, A J ; Smeekens, S P ; Steiner, D F ; Docherty, K. / Site-directed mutagenesis and expression of PC2 in microinjected Xenopus oocytes. In: The Journal of Biological Chemistry. 1991 ; Vol. 266, No. 35. pp. 24011-7.
@article{c5f61e39790e47c7aa1309a207a9e029,
title = "Site-directed mutagenesis and expression of PC2 in microinjected Xenopus oocytes",
abstract = "The biosynthesis and post-translational maturation of PC2, a neuroendocrine-specific Kex2-like endoprotease, following expression in Xenopus oocytes is described. The initial translation product was a 75-kDa membrane-associated protein which was released from the oocytes as a glycosylated 71-kDa protein. During extended chase periods, the extracellular 71-kDa protein was converted to a mature 68-kDa product. A deletion mutant lacking a putative COOH-terminal amphipathic helix was still membrane-associated, suggesting that this domain was not essential for attachment of PC2 to membranes. Two putative proregion cleavage site mutants were also constructed. Conversion of the 75-kDa peptide to the 71-kDa peptide involved cleavage at the sequence Lys-Arg-Arg-Arg (amino acids 78-81), since mutation of this sequence to Lys-Val-Arg-Leu resulted in the secretion of the 75-kDa peptide. Extracellular conversion of the 71-kDa peptide to the 68-kDa peptide involved cleavage at the sequence Arg-Lys-Lys-Arg (amino acids 106-109), since deletion of this tetrabasic sequence resulted in secretion of the 71-kDa peptide without further conversion to the 68-kDa form. Finally, a mutation which changed a catalytically important Asp to Asn did not affect processing of proPC2. These results may be relevant to our understanding of mechanisms in the intracellular sorting and maturation of proPC2 in neuroendocrine cells.",
keywords = "Amino Acid Sequence, Animals, Base Sequence, Cell Membrane, Enzyme Precursors, Kinetics, Microinjections, Molecular Sequence Data, Mutagenesis, Site-Directed, Oligodeoxyribonucleotides, Oocytes, Plasmids, Proprotein Convertase 2, Protease Inhibitors, Protein Biosynthesis, Protein Processing, Post-Translational, RNA, Messenger, Restriction Mapping, Serine Endopeptidases, Transcription, Genetic, Xenopus laevis",
author = "Shennan, {K I} and Seal, {A J} and Smeekens, {S P} and Steiner, {D F} and K Docherty",
year = "1991",
month = "12",
day = "15",
language = "English",
volume = "266",
pages = "24011--7",
journal = "The Journal of Biological Chemistry",
issn = "0021-9258",
publisher = "AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC",
number = "35",

}

TY - JOUR

T1 - Site-directed mutagenesis and expression of PC2 in microinjected Xenopus oocytes

AU - Shennan, K I

AU - Seal, A J

AU - Smeekens, S P

AU - Steiner, D F

AU - Docherty, K

PY - 1991/12/15

Y1 - 1991/12/15

N2 - The biosynthesis and post-translational maturation of PC2, a neuroendocrine-specific Kex2-like endoprotease, following expression in Xenopus oocytes is described. The initial translation product was a 75-kDa membrane-associated protein which was released from the oocytes as a glycosylated 71-kDa protein. During extended chase periods, the extracellular 71-kDa protein was converted to a mature 68-kDa product. A deletion mutant lacking a putative COOH-terminal amphipathic helix was still membrane-associated, suggesting that this domain was not essential for attachment of PC2 to membranes. Two putative proregion cleavage site mutants were also constructed. Conversion of the 75-kDa peptide to the 71-kDa peptide involved cleavage at the sequence Lys-Arg-Arg-Arg (amino acids 78-81), since mutation of this sequence to Lys-Val-Arg-Leu resulted in the secretion of the 75-kDa peptide. Extracellular conversion of the 71-kDa peptide to the 68-kDa peptide involved cleavage at the sequence Arg-Lys-Lys-Arg (amino acids 106-109), since deletion of this tetrabasic sequence resulted in secretion of the 71-kDa peptide without further conversion to the 68-kDa form. Finally, a mutation which changed a catalytically important Asp to Asn did not affect processing of proPC2. These results may be relevant to our understanding of mechanisms in the intracellular sorting and maturation of proPC2 in neuroendocrine cells.

AB - The biosynthesis and post-translational maturation of PC2, a neuroendocrine-specific Kex2-like endoprotease, following expression in Xenopus oocytes is described. The initial translation product was a 75-kDa membrane-associated protein which was released from the oocytes as a glycosylated 71-kDa protein. During extended chase periods, the extracellular 71-kDa protein was converted to a mature 68-kDa product. A deletion mutant lacking a putative COOH-terminal amphipathic helix was still membrane-associated, suggesting that this domain was not essential for attachment of PC2 to membranes. Two putative proregion cleavage site mutants were also constructed. Conversion of the 75-kDa peptide to the 71-kDa peptide involved cleavage at the sequence Lys-Arg-Arg-Arg (amino acids 78-81), since mutation of this sequence to Lys-Val-Arg-Leu resulted in the secretion of the 75-kDa peptide. Extracellular conversion of the 71-kDa peptide to the 68-kDa peptide involved cleavage at the sequence Arg-Lys-Lys-Arg (amino acids 106-109), since deletion of this tetrabasic sequence resulted in secretion of the 71-kDa peptide without further conversion to the 68-kDa form. Finally, a mutation which changed a catalytically important Asp to Asn did not affect processing of proPC2. These results may be relevant to our understanding of mechanisms in the intracellular sorting and maturation of proPC2 in neuroendocrine cells.

KW - Amino Acid Sequence

KW - Animals

KW - Base Sequence

KW - Cell Membrane

KW - Enzyme Precursors

KW - Kinetics

KW - Microinjections

KW - Molecular Sequence Data

KW - Mutagenesis, Site-Directed

KW - Oligodeoxyribonucleotides

KW - Oocytes

KW - Plasmids

KW - Proprotein Convertase 2

KW - Protease Inhibitors

KW - Protein Biosynthesis

KW - Protein Processing, Post-Translational

KW - RNA, Messenger

KW - Restriction Mapping

KW - Serine Endopeptidases

KW - Transcription, Genetic

KW - Xenopus laevis

M3 - Article

VL - 266

SP - 24011

EP - 24017

JO - The Journal of Biological Chemistry

JF - The Journal of Biological Chemistry

SN - 0021-9258

IS - 35

ER -