IUBMB Enzyme Nomenclature


Accepted name: aspartate/glutamate leucyltransferase

Reaction: (1) L-leucyl-tRNALeu + N-terminal L-glutamyl-[protein] = tRNALeu + N-terminal L-leucyl-L-glutamyl-[protein]
(2) L-leucyl-tRNALeu + N-terminal L-aspartyl-[protein] = tRNALeu + N-terminal L-leucyl-L-aspartyl-[protein]

Other name(s): leucylD,E-transferase; bpt (gene name)

Systematic name: L-leucyl-tRNALeu:[protein] N-terminal L-glutamate/L-aspartate leucyltransferase

Comments: The enzyme participates in the N-end rule protein degradation pathway in certain bacteria, by attaching the primary destabilizing residue L-leucine to the N-termini of proteins that have an N-terminal L-aspartate or L-glutamate residue. Once modified, the proteins are recognized by EC, the ClpAP/ClpS endopeptidase system. cf. EC, lysine/arginine leucyltransferase, and EC, arginyltransferase.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Graciet, E., Hu, R.G., Piatkov, K., Rhee, J.H., Schwarz, E.M. and Varshavsky, A. Aminoacyl-transferases and the N-end rule pathway of prokaryotic/eukaryotic specificity in a human pathogen. Proc. Natl. Acad. Sci. USA 103 (2006) 3078-3083. [PMID: 16492767]

[EC created 2016]

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