Both potential dolichol recognition sequences of hamster GlcNAc-1-phosphate transferase are necessary for normal enzyme function

Arun K. Datta, Mark A. Lehrman

Research output: Contribution to journalArticle

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Abstract

A potential dolichol recognition sequence (PDRS) with the 11-residue consensus Y-I/V-X-F/Y-X-X-I-P-F-X-F/Y can be found in each of five microsomal enzymes that interact with dolichol or a dolichol derivative. However, no direct evidence demonstrating a role for the PDRSs has been reported. Hamster UDP-GlcNAc:dolichol phosphate JV-acetylglucosamine-1-phosphate transferase (GPT) differs from the other enzymes by having two PDRSs. Stable CHO-K1 transfectants were created that expressed elevated amounts of normal GPT, GPT with a scramble mutation at the first PDRS (nearest the amino terminus), or GPT with a triple alanine-replacement mutation at the second PDRS. The mutant enzymes had no detectable catalytic activity in vivo, but were fully capable of conferring cellular resistance to the GPT inhibitor tunicamycin. In vitro studies with membrane preparations confirmed that the mutant enzymes were catalytically inactive and also showed that their recovery in microsomes was diminished compared with normal enzyme. These data demonstrate that each PDRS of hamster GPT is necessary for normal enzyme function. The implications of these data for possible roles of the PDRSs are discussed.

Original languageEnglish (US)
Pages (from-to)12663-12668
Number of pages6
JournalJournal of Biological Chemistry
Volume268
Issue number17
StatePublished - Jun 15 1993

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Dolichol
Transferases
Cricetinae
Enzymes
Dolichol Phosphates
Tunicamycin
Mutation
Uridine Diphosphate
Acetylglucosamine
Microsomes
Alanine
N-acetylglucosamine-1-phosphate
Catalyst activity
Phosphates
Derivatives
Membranes
Recovery

ASJC Scopus subject areas

  • Biochemistry

Cite this

Both potential dolichol recognition sequences of hamster GlcNAc-1-phosphate transferase are necessary for normal enzyme function. / Datta, Arun K.; Lehrman, Mark A.

In: Journal of Biological Chemistry, Vol. 268, No. 17, 15.06.1993, p. 12663-12668.

Research output: Contribution to journalArticle

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