Amino acid replacement: S551Y.
Nucleotide substitution: C2304A. Amino acid replacement: S551Y.
Ser551 --> Tyr
C4358815A
C2304A
S551Y | norpA-PA; S551Y | norpA-PB; S551Y | norpA-PC; S551Y | norpA-PD; S551Y | norpA-PE; S551Y | norpA-PF
S551Y
Site of nucleotide substitution in mutant inferred by FlyBase based on reported amino acid change.
In larvae with the temperature-sensitive norpA31 allele reared at the permissive temperature (25[o]C), thermal preference is indistinguishable from wild-type, whereas after a 37[o]C heat shock the larvae lost their ability to choose 18[o]C.
The amplitude of quantum bumps in mutant photoreceptors is smaller than wild type (when ATP is present in the intracellular solution during recordings).
The size and shape of the quantum bumps are unaffected, although the latency is significantly different from wild type.
Photoreceptors degenerate with age. Photoreceptor potential disappears within less than 1 second with a temperature shift to nonpermissive temperatures.
Temperature-sensitive mutation.
temperature-sensitive allele
Heisenberg.