A mutated form of arm, in which amino acids 549-606 are deleted to produce a fusion of Arm repeats 10 and 11 and deletion of the insertion normally found between these repeats, is expressed under the control of its own promoter. The protein is tagged with a Tag:MYC epitope at residue 784 in the Gly/Pro-rich region close to the C-terminus. arm 3' trailer sequences are also present. The protein produced shows normal levels of binding to α-Cat protein and to shg protein in a coimmunoprecipitation assay.
Embryos expressing armS12.T:Hsap\MYC in a arm4 background have a "lawn of denticles" cuticle phenotype.
Many photoreceptors are rescued from death in ApcQ8 homozygotes carrying one copy of armS12.T:Hsap\MYC in an arm4/+ background.
Embryos exhibit very weak segment polarity defects, adherens junctions are normal.
arm4, armS12.Tag:MYC has denticle | ectopic phenotype, suppressible by pan::pygopygoΔPHD-ΔNTCF.UAS.Tag:HA/Scer\GAL4arm.PS
arm4, armS12.Tag:MYC has embryonic/first instar larval cuticle phenotype, suppressible by pan::pygopygoΔPHD-ΔNTCF.UAS.Tag:HA/Scer\GAL4arm.PS
The "lawn of denticles" cuticle phenotype seen in embryos carrying armS12.T:Hsap\MYC in an arm4 background is substantially rescued by expression of pan::pygopygoΔPHD-ΔNTCF.Scer\UAS.T:Ivir\HA1 under the control of Scer\GAL4arm.PS; a segmented pattern of denticle bands and naked cuticle is restored.
arm4, armS12.Tag:MYC is not rescued by Scer\GAL4arm.PS/armUAS.Tag:M(sev)
armS12.Tag:MYC rescues arm3
The "lawn of denticles" cuticle phenotype seen in embryos carrying armS12.T:Hsap\MYC in an arm4 background is not rescued by ubiquitous expression of armScer\UAS.T:sev-TM using Scer\GAL4arm.PS. Ubiquitous expression of armS10.Scer\UAS.T:Hsap\MYC using Scer\GAL4arm.PS produces ectopic naked cuticle in embryos carrying armS12.T:Hsap\MYC in an arm4 background.
Used in a coimmunoprecipitation assay to study shg binding and analysed by SDS-PAGE to study protein phosphorylation and stability.