DLC8

DLC8 (PF3D7_1213600) is a putative dynein light chain that in Plasmodium falciparum blood-stage parasites associates with the actomyosin machinery rather than functioning in a flagellar context (PMID:20421304). It physically interacts with myosin A and actin 1, with binding mapped to sequences containing the SDIE and/or EEMKT motifs in the upper 50-kDa segment of the myosin A head domain and to subdomain IV of actin 1 (PMID:20421304). Consistent with these interactions, DLC8 shows a cytoplasmic distribution, co-localizes with myosin A, and is expressed predominantly in late trophozoites and schizonts (PMID:20421304). Beyond this physical association with the actomyosin components and its expression pattern, the functional role of DLC8 has not been characterized in the available corpus.

1. 2010 Medium

   To determine whether this dynein light chain has a role outside flagellar motility, its binding partners were sought — establishing that DLC8 engages the blood-stage actomyosin machinery through defined interaction surfaces on myosin A and actin 1.

   Evidence Reciprocal co-immunoprecipitation with domain mapping in P. falciparum blood-stage parasites

   PMID:20421304

   Open questions at the time

   • No structural model of the DLC8–myosin A or DLC8–actin 1 interface
   • Functional consequence of the interaction for motor activity or motility not tested
   • Single lab, not independently confirmed
2. 2010 Medium

   To place the interaction in a cellular context, localization was examined — showing DLC8 has a cytoplasmic distribution and co-localizes with myosin A, consistent with its binding data.

   Evidence Fluorescence tagging and immunofluorescence microscopy in P. falciparum blood stages

   PMID:20421304

   Open questions at the time

   • Spatial resolution insufficient to define sub-compartmental positioning
   • Whether co-localization reflects a stable complex in vivo not established
3. 2010 Low

   To assess whether DLC8 is required for parasite survival, gene disruption was attempted — the failure to disrupt the locus in two species inferred essentiality but did not demonstrate it directly.

   Evidence Reverse-genetic gene disruption attempts in P. falciparum and P. berghei

   PMID:20421304

   Open questions at the time

   • Negative result; essentiality inferred but not directly demonstrated
   • Locus inaccessibility cannot be excluded as the cause of failure
   • No conditional knockdown to define the null phenotype
4. 2010 Low

   To relate expression to function, protein abundance was profiled across the erythrocytic cycle — peaking in late trophozoites and schizonts, arguing for a blood-stage role rather than flagellar motility.

   Evidence Stage-resolved protein detection in P. falciparum blood stages

   PMID:20421304

   Open questions at the time

   • Single method with no functional follow-up
   • Expression peak does not identify the biochemical process DLC8 serves

• The mechanistic function of DLC8 within the actomyosin machinery — whether it modulates motor activity, regulates actin, or serves a scaffolding role — remains unresolved.
• No functional assay linking DLC8 to actomyosin motor output
• No structural characterization of its interactions
• No conditional loss-of-function phenotype