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 (lī′gās′, -gāz′)
Any of a class of enzymes that catalyze the linkage of two large molecules.

[Latin ligāre, to bind; see leig- in Indo-European roots + -ase.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biochemistry) any of a class of enzymes that catalyse the formation of covalent bonds and are important in the synthesis and repair of biological molecules, such as DNA
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈlaɪ geɪs, -geɪz)

an enzyme that catalyzes the joining of two molecules by forming a covalent bond accompanied by the hydrolysis of ATP. Also called synthetase.
[1961; < Latin lig(āre) to tie, bind]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
This is what the bacterial LPX-E3 ligases - which can penetrate into the cell without any aid and can act intracellularly - are designed to prevent.
elegans, multiple ubiquitin ligases have been implicated in UPS-dependent regulation of AMPAR synaptic abundance, including the anaphase-promoting complex (APC) [48], CUL3/KEL-8 [49], and RPM-1 [50].
Nurix's technology platform is focused on the manipulation of the ubiquitin system and its component E3 ligases, the key enzymes responsible for controlling protein levels in human cells.
Under the multi-year collaboration, Nurix will utilize its proprietary drug discovery platform to identify novel agents that utilize E3 ligases to induce degradation of specified drug targets and Gilead will have an option to license drug candidates directed to up to five targets resulting from the work.
Towards the end of the defense process, transcription factors (WRKY and MYB) and regulatory enzyme such as E3 ubiquitin ligases will regulate the expression of defense-associated genes (18-31).
Of key relevance in the proteasome system are the so-called E3-ubiquitin ligases. These enzymes mark proteins for degradation to keep the cells in a healthy state.
Goh et al., "Roles of the TRAF6 and Pellino E3 ligases in MyD88 and RANKL signaling," Proceedings of the National Academy of Sciences of the United States of America, vol.
Ja em relacao as vias de degradacao, destaca-se a via proteassomal, representada pelo sistema ubiquitina-proteassoma, que age de forma seletiva na proteolise muscular, atuando de forma importante no processo atrofico atraves da sinalizacao de duas ligases chave desse sistema, conhecidas como MURF-1 e MAFBx.
Biochemists and biologists from around the world offer 35 articles in various areas of biochemistry, such as protein misfolding diseases, amyloid proteins at the molecular level, the mechanisms and functions of spatial protein quality control, regulated protein degradation and the ubiquitin system and autophagy, ubiquitin ligases, mechanisms of deubiquitinase specificity and regulation, proteasomal and autophagic degradation systems, mechanisms of autophagy initiation, the systems biology of metabolism, metabolite measurement, isocitrate dehydrogenase and cancer therapeutics, tools for patchy switching in biology, the biochemistry of reductive dehalogenation, electric fields and enzyme catalysis, the eukaryotic DNA replication fork, and the telomerase mechanism of telomere synthesis.
(2001) Identification of ubiquitin ligases required for skeletal muscle atrophy.
Ciechanover, "Ubiquitination of E3 ligases: self-regulation of the ubiquitin system via proteolytic and nonproteolytic mechanisms," Cell Death and Differentiation, vol.