Head region of unconventional myosin I family members is responsible for the organ-specificity of their roles in left-right polarity in Drosophila.
In Drosophila, Myosin31DF (Myo31DF), encoding a Myosin ID protein, has crucial roles in left-right (LR) asymmetric development. Loss of Myo31DF function leads to laterality inversion for many organs, including the embryonic gut. Here, we found that Myo31DF was required before LR asymmetric morphogenesis in the hindgut, suggesting it functions in LR patterning instead of directly in hindgut morphological changes. Myosin61F (Myo61F) encodes another Myosin I, and Myo31DF or Myo61F overexpression reverses the laterality of different organs. Myo31DF and Myo61F have domains conserved in Myosin proteins, particularly in the proteins' head regions. We studied the roles of these domains in LR patterning using overexpression analysis. The Actin-binding and ATP-binding domains were essential for both proteins, but the IQ domains, binding sites for Myosin light chains, were required only by Myo31DF. Our results also suggest that the organ specificities of the Myo31DF and Myo61F activities depended on their head regions.
Department of Biological Science and Technology, Tokyo University of Science, Noda, Chiba, Japan.
Shunya
S
Hozumi
Reo
R
Maeda
Maiko
M
Taniguchi-Kanai
Takashi
T
Okumura
Kiichiro
K
Taniguchi
Yasuhiro
Y
Kawakatsu
Naotaka
N
Nakazawa
Ryo
R
Hatori
Kenji
K
Matsuno
D000818:Animals; D019521:Body Patterning; D029721:Drosophila Proteins / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000196:embryology* / Q000235:genetics / Q000378:metabolism*; D004625:Embryo, Nonmammalian / Q000196:embryology / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D006257:Head / Q000196:embryology*; D008648:Mesoderm / Q000196:embryology / Q000378:metabolism; D024461:Myosin Type I / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D009928:Organ Specificity
D029721:Drosophila Proteins; C513226:Myo31DF protein, Drosophila; C534574:myo61F protein, Drosophila; D024461:Myosin Type I