Transcript 48 (T48) encodes a protein with a predicted signal peptide and a potential transmembrane domain. During gastrulation, the product of T48 contributes to apical constriction by recruitment of the Rho GEF encoded by RhoGEF2 to the apical cell membrane and functions downstream of the transcription factor encoded by twi.

G protein-coupled receptor ligand; Coordinates cell shape changes during formation of the ventral furrow and invagination of the posterior midgut primordium, by inducing apical constriction of cells in spatially and temporally defined manners. Could function as a secreted signal to initiate apical constriction by acting as a ligand for an unidentified G protein- coupled receptor, which in turn activates the G protein alpha subunit encoded by concertina, in neighboring cells. Such an intracellular pathway would ultimately induce contraction of the apical actin-myosin network. In the ven [...]

Smog, isoform D; Smog (smog) encodes a G-protein-coupled receptor with a key role in gastrulation. It contributes to cell intercalation and apical constriction via myosin II activation.

Methuselah-like 1 (mthl1) encodes a G protein coupled receptor (GPCR) in the Methuselah clade of GPCRs. It interacts with the secreted morphogen encoded by fog to specify patterns of epithelial tissue folding during gastrulation and wing imaginal disc folding. Upon binding to the product of fog, the product of mthl1 activates apical constriction through the Concertina-RhoGEF2-Rho pathway.

Rho-associated protein kinase; Rho kinase (Rok) encodes a kinase that, when activated by the GTP form of the product of Rho1, phosphorylates and modulates cytoskeletal proteins, particularly myosin II. Dynamic regulation of this kinase in subcellular locales influences cell polarization, movement, and shape during interphase and mitosis.