Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Query: EC:2.7.11.25 (
MEKK1
)
1,856
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
The ubiquitin ligase Highwire restrains synaptic growth and promotes evoked neurotransmission at NMJ synapses in
Drosophila
Highwire regulates synaptic morphology by downregulating the
MAP3K
Wallenda, but excess Wallenda signaling does not account for the decreased presynaptic release observed in
highwire
mutants. Hence, Highwire likely has a second substrate that inhibits neurotransmission. Highwire targets the
NAD
+
biosynthetic and axoprotective enzyme dNmnat to regulate axonal injury responses. dNmnat localizes to synapses and interacts with the active zone protein Bruchpilot, leading us to hypothesize that Highwire promotes evoked release by downregulating dNmnat. Here, we show that excess dNmnat is necessary in
highwire
mutants and sufficient in wild-type larvae to reduce quantal content, likely via disruption of active zone ultrastructure. Catalytically active dNmnat is required to drive defects in evoked release, and depletion of a second
NAD
+
synthesizing enzyme is sufficient to suppress these defects in
highwire
mutants, suggesting that excess
NAD
+
biosynthesis is the mechanism inhibiting neurotransmission. Thus, Highwire downregulates dNmnat to promote evoked synaptic release, suggesting that Highwire balances the axoprotective and synapse-inhibitory functions of dNmnat.
...
PMID:The E3 ligase Highwire promotes synaptic transmission by targeting the NAD-synthesizing enzyme dNmnat. 3069 30
