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Information on EC 2.7.7.100 - SAMP-activating enzyme

for references in articles please use BRENDA:EC2.7.7.100

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IUBMB Comments

Contains Zn2+. The enzyme catalyses the activation of SAMPs (Small Archaeal Modifier Proteins), which are ubiquitin-like proteins found only in the Archaea, by catalysing the ATP-dependent formation of a SAMP adenylate in which the C-terminal glycine of SAMP is bound to AMP via an acyl-phosphate linkage. The product of this activity can accept a sulfur atom to form a thiocarboxylate moiety that acts as a sulfur carrier involved in thiolation of tRNA and other metabolites such as molybdopterin. Alternatively, the enzyme can also catalyse the transfer of SAMP from its activated form to an internal cysteine residue, leading to a process termed SAMPylation (see EC 6.2.1.55, E1 SAMP-activating enzyme).

The expected taxonomic range for this enzyme is: Halobacteria
Reaction Schemes
+
[SAMP]-Gly-Gly
=
+
[SAMP]-Gly-Gly-AMP

Synonyms
ubiquitin-activating e1 enzyme homolog, more

REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
ATP + [SAMP]-Gly-Gly = diphosphate + [SAMP]-Gly-Gly-AMP
show the reaction diagram
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PATHWAY SOURCE
PATHWAYS
MetaCyc
protein SAMPylation and SAMP-mediated thiolation
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