Recombinant Human MDN1 Protein: Properties & Research Uses

Recombinant Human MDN1 Protein is a high-molecular-weight AAA-ATPase essential for pre-ribosome maturation and nuclear export, making it a critical reagent for studying ribosome biogenesis and related cellular processes.

Protein Name

Recombinant Human MDN1 Protein

Gene Name

MDN1 (also known as MIDAS, REAL)

Protein Family

AAA-ATPase superfamily

Primary Function

Pre-60S ribosomal subunit maturation and nuclear export

Species Origin

Homo sapiens (Human)

Research Application

Ribosome biogenesis, AAA-ATPase mechanism studies, protein interaction assays

What Is MDN1 and Why Does It Matter?

MDN1 (Midasin) is one of the largest proteins encoded by the human genome, belonging to the AAA-ATPase (ATPases Associated with diverse cellular Activities) superfamily. It plays an indispensable role in the biogenesis of the large (60S) ribosomal subunit, acting as a molecular chaperone and mechanoenzyme that removes assembly factors from pre-ribosomal particles in the nucleus prior to their export to the cytoplasm.

The protein contains multiple AAA domains arranged in a ring-like structure, as well as a distinctive MIDAS (Metal Ion-Dependent Adhesion Site) domain at its C-terminus, which mediates interactions with ribosome assembly factors such as Rix1 and other pre-60S components. Loss of MDN1 function results in profound defects in ribosome assembly, impaired cell proliferation, and in model organisms, lethality, underscoring its fundamental importance in cell biology.

Biochemical Properties of Recombinant Human MDN1 Protein

Recombinant Human MDN1 Protein is produced using recombinant DNA technology to deliver a research-grade reagent suitable for in vitro biochemical assays. As a member of the AAA-ATPase superfamily, MDN1 hydrolyzes ATP to generate the mechanical force required to remodel macromolecular complexes, specifically displacing biogenesis factors from nascent pre-60S ribosomal subunits.

Key biochemical characteristics include its exceptionally large molecular weight—MDN1 is encoded by a gene spanning approximately 17 kb and produces a protein of roughly 5,596 amino acids in humans—its ATPase enzymatic activity, and its modular domain architecture comprising six AAA modules, a linker region, and the C-terminal MIDAS domain. These features make it a structurally and functionally complex target for biochemical investigation.

Researchers should note that due to the large size of MDN1, expression, purification, and handling require specialized protocols. Aladdin Scientific's recombinant preparation is intended to support in vitro studies under controlled laboratory conditions.

Research Applications of Recombinant Human MDN1 Protein

Recombinant Human MDN1 Protein is a valuable tool across several research domains:

• Ribosome Biogenesis Studies: MDN1 is a central player in the maturation pathway of the large ribosomal subunit. Recombinant MDN1 can be used in cell-free reconstitution assays to dissect the molecular mechanisms by which assembly factors are removed from pre-60S particles.
• AAA-ATPase Mechanistic Research: As one of the largest known AAA-ATPases, MDN1 serves as a model for understanding how ring-forming ATPases generate and transmit mechanical force to remodel protein complexes. ATPase activity assays and structural studies benefit from access to purified recombinant protein.
• Protein–Protein Interaction Studies: The MIDAS domain of MDN1 mediates specific interactions with biogenesis adaptor proteins. Pull-down assays, co-immunoprecipitation validation experiments, and surface plasmon resonance studies can utilize recombinant MDN1 to map these interactions.
• Drug Discovery and Target Validation: Given MDN1's essential role in rapidly dividing cells, it has attracted interest as a potential anticancer target. Recombinant protein enables biochemical screening of small-molecule inhibitors of ATPase activity or protein–protein interactions.

Handling, Storage, and Quality Considerations

To maintain the activity and integrity of Recombinant Human MDN1 Protein, researchers should follow standard best practices for recombinant protein handling:

• Storage: Store at the temperature specified on the product datasheet, typically −80 °C for long-term storage. Avoid repeated freeze–thaw cycles, which can lead to protein aggregation and loss of activity.
• Reconstitution: If supplied lyophilized, reconstitute with the recommended buffer as specified in the product documentation. Allow the protein to equilibrate before use.
• Quality Control: Aladdin Scientific's recombinant proteins are subject to quality control testing. Consult the product datasheet for details on purity assessment (e.g., SDS-PAGE), identity confirmation, and activity validation.
• Experimental Controls: When using MDN1 in functional assays, include appropriate positive and negative controls to validate assay performance and confirm protein activity.

For specific buffer compositions, purity grades, and lot-specific data, refer to the product datasheet accompanying SKU rp374544 or contact Aladdin Scientific technical support.

Frequently asked questions

What is the biological function of MDN1 in human cells?

MDN1 (Midasin) is a large AAA-ATPase that functions as an essential factor in the biogenesis of the 60S ribosomal subunit. It uses ATP hydrolysis to generate mechanical force that displaces pre-ribosome assembly factors from nascent large ribosomal subunits in the nucleus, allowing their maturation and subsequent export to the cytoplasm. This activity is essential for cell viability and proliferation.

What research applications is Recombinant Human MDN1 Protein suitable for?

Recombinant Human MDN1 Protein is suitable for in vitro biochemical applications including ATPase activity assays, protein–protein interaction studies (such as pull-down and co-immunoprecipitation experiments), structural biology investigations, and small-molecule inhibitor screening. It is particularly relevant for researchers studying ribosome biogenesis, AAA-ATPase mechanisms, and MDN1 as a potential therapeutic target in cancer biology.

How should Recombinant Human MDN1 Protein be stored to preserve its activity?

Recombinant Human MDN1 Protein should be stored according to the conditions specified on the product datasheet, generally at −80 °C for long-term storage. Repeated freeze–thaw cycles should be avoided as they may lead to protein aggregation and reduced activity. It is recommended to aliquot the protein upon receipt to minimize the number of freeze–thaw cycles experienced by any given aliquot.

Why is MDN1 considered a potential anticancer target?

MDN1 is essential for ribosome biogenesis, a process that is significantly upregulated in rapidly proliferating cancer cells due to their high demand for protein synthesis. Because MDN1 is required for the production of functional ribosomes, its inhibition could selectively impair the growth of cancer cells that are particularly dependent on elevated ribosome output. Recombinant MDN1 protein facilitates biochemical studies aimed at identifying and validating such inhibitors.

References

1. Bassler J, Paternoga H, Holdermann I, et al. A network of assembly factors is involved in remodeling rRNA elements during preribosome maturation. J Cell Biol. 2014.
2. Raman N, Weir E, Müller S. The AAA ATPase MDN1 acts as a SUMO-targeted regulator in mammalian pre-ribosome remodeling. Mol Cell. 2016.
3. Chen Z, Suzuki H, Kobayashi A, et al. Structural insights into Mdn1, an essential AAA protein required for ribosome biogenesis. Cell. 2018.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.