Protein spire; Acts as an actin nucleation factor, remains associated with the slow-growing pointed end of the new filament. Promotes dissociation of capu from the barbed end of actin filaments. Involved in intracellular vesicle transport along actin fibers, providing a novel link between actin cytoskeleton dynamics and intracellular transport. Required for localization of determinants within the developing oocyte to the posterior pole and to the dorsal anterior corner. Links Rho family signaling and Jnk function to the actin cytoskeleton.

Cappuccino (capu) encodes a formin family protein that nucleates actin filaments and accelerates their elongation. It works with the product of spir to build an actin mesh that fills the oocyte during mid-oogenesis. capu is necessary for polarity establishment and female fertility.

Protein gurken; Critical for defining the anterior-posterior and dorsal- ventral axes of the egg. May signal directly to dorsal follicle cells through the receptor torpedo (top). During oogenesis this signaling pathway instructs follicle cells to follow a dorsal pathway of development rather than the default ventral pathway.

Egalitarian, isoform B; Egalitarian (egl) encodes an RNA binding protein that links specific mRNAs to the minus end-directed microtubule motor, cytoplasmic dynein-1.

Oo18 RNA-binding protein (orb) encodes a RNA-binding protein required for the formation of the egg chamber and establishment of polarity during oogenesis. It is involved in mRNA polyadenylation and the regulation of osk mRNA translation.

NHP2-like protein 1 homolog; Binds to the 5'-stem-loop of U4 snRNA and may play a role in the late stage of spliceosome assembly. The protein undergoes a conformational change upon RNA-binding (By similarity); Belongs to the eukaryotic ribosomal protein eL8 family.

Protein bicaudal D; This protein is essential for differentiation. It may play a role in localizing of Nanos (a maternal determinant) activity in oocytes. During oogenesis, plays a specific role, together with Rab6 but independently of Sec5, in the polarization of the oocyte microtubule cytoskeleton, in oskar mRNA localization and in the anterodorsal secretion of grk. Plays a role in the biogenesis of annulate lamellae containing nuclear pore complex components.

Maternal effect protein oskar; Organizes the germ plasm and directs localization of the posterior determinant nanos. Oskar protein is required to keep nos RNA and staufen protein at the posterior pole.

CG10206-PA; snoRNA binding. It is involved in the biological process described with: rRNA processing.