PF3D7_0519800

PF3D7_0519800 (EELM2) is a nuclear protein of Plasmodium falciparum implicated in epigenetic control of gene expression during asexual blood stage development (PMID:23181666, PMID:39412522). It was first identified as a genuine nuclear resident by mass spectrometry-based nuclear proteomics with localization confirmed in transgenic parasites (PMID:23181666), and was subsequently recovered as a physical interactor of the chromatin-associated microrchidia protein PfMORC (PF3D7_1468100) within a nuclear protein complex (PMID:39412522). Beyond its nuclear localization and its membership in the PfMORC complex, no direct molecular function for EELM2 itself has been experimentally defined in the available corpus; its role is currently inferred only from complex association, and it has not been functionally perturbed.

1. 2012 Medium

   Establishing where EELM2 resides was the first step in assigning it any function; nuclear proteomics placed the protein in the nucleus, consistent with a role in nuclear/chromatin processes rather than cytoplasmic metabolism.

   Evidence Mass spectrometry-based nuclear organellar proteomics with validation by fluorescence imaging of transgenic cell lines

   PMID:23181666

   Open questions at the time

   • Localization alone does not indicate molecular activity or DNA/chromatin binding
   • No interaction partners identified at this stage
   • Sub-nuclear distribution (heterochromatin vs euchromatin) not resolved
2. 2024 Medium

   Connecting EELM2 to a defined machinery, co-immunoprecipitation showed it physically associates with the chromatin-remodeling PfMORC complex, providing the first mechanistic context by linking it to epigenetic regulation of asexual-stage gene expression.

   Evidence Multi-omic analysis including PfMORC pull-down/interaction proteomics identifying PfEELM2 as an interactor

   PMID:39412522

   Open questions at the time

   • Single Co-IP/pulldown from one lab with no direct functional perturbation of EELM2 itself
   • Whether the interaction is direct or bridged by other complex members is unresolved
   • The specific contribution of EELM2 to PfMORC complex activity is undefined

• The direct molecular function of EELM2 within the PfMORC complex — and whether it is required for the complex's chromatin/gene-regulatory activity — remains unestablished.
• No genetic knockout/knockdown of EELM2 to test its role
• No biochemical or enzymatic activity assigned to EELM2
• No structural model or definition of the EELM2 domain's contribution to the complex