PPA2 Antibodies

Background

The PPA2 gene encodes a key enzyme within mitochondria responsible for catalyzing the hydrolysis of inorganic pyrophosphate. This enzyme directly regulates cellular energy homeostasis by maintaining the balance of pyrophosphate metabolism. Its encoded protein is located in the mitochondrial matrix and plays a core role in biological processes such as ATP synthesis and nucleic acid metabolism, especially being crucial for maintaining the functions of high-energy-consuming tissues such as the heart muscle and nerves. In 2016, the "American Journal of Human Genetics" study first clarified that its biallelic mutations can lead to autosomal recessive genetic diseases, and patients present with syndromes such as progressive cardiomyopathy, neurological degeneration and lactic acidosis. As a "molecular switch" in the energy metabolism pathway, PPA2 has become an important model for studying the association between mitochondrial function defects and human diseases. The research on the association between its mutation lineages and clinical phenotypes has continuously provided new evidence for genetic diagnosis in recent years.

Structure Function Application Advantage Our Products

Structure of PPA2

The inorganic pyrophosphatase encoded by the PPA2 gene is a key mitochondrial metabolic regulatory protein, with a molecular weight of approximately 32-35 kDa. This protein has a highly conserved catalytic core in different species, but there are interspecific differences in the N-terminal mitochondrial targeting sequence.

Species	Human	Mouse	Bovine	Zebrafish	Yeast
Molecular Weight (kDa)	33.5	33.2	33.8	34.1	35.2
Primary Structural Differences	Containing 256 amino acids, with typical PPase domain structure	Mitochondrial positioning signal peptide is shorter	Highly conserved catalytic activity center	The C-terminal extension sequence is longer	Cytoplasmic synthesis is required before transportation

This protein forms a catalytic domain through its conserved β-α-β folding, creating four active centers to bind divalent metal ions. It is particularly worth noting that the three aspartic acid residues in its active site (D42/D44/D158 in human PPA2) form a stable catalytic network with Mg²⁺through coordination bonds, a feature that is completely consistent in all eukaryotes. The unique diarginine motif at the N-terminal constitutes a mitochondrial matrix targeting signal, ensuring that the protein is accurately located within the mitochondrial lumen to perform pyrophosphate hydrolysis function.

Fig. 1: Schematic of PPA2's biological functions. Fig. 1 Schematic of PPA2's biological functions.¹

Key structural properties of PPA2:

Conserved β-α-β catalytic domain
Four active center in the composition of the metal ion binding sites
Mitochondrial matrix-targeted signaling peptides

Functions of PPA2

The core function of PPA2 protein is to maintain the metabolic balance of pyrophosphate (PPi) within cells. Its main physiological functions include:

Function	Description
Regulation of energy metabolism	By hydrolyzing inorganic pyrophosphate (PPi) to generate orthophosphate (Pi), biochemical reactions such as ATP synthesis are promoted towards energy production.
Maintenance of mitochondrial function	Eliminate the accumulated PPi in the mitochondrial matrix to prevent its inhibitory effect on membrane potential and oxidative phosphorylation processes.
Regulation of nucleic acid synthesis	Maintain the PPi/Pi balance to provide a suitable substrate environment for DNA/RNA polymerase and ensure the normal replication of genetic material.
Participation in bone development	Regulate the crystallization process of hydroxyapatite in osteoblasts to prevent abnormal accumulation of PPi from causing bone mineralization defects.
Cellular calcium homeostasis assistance	By regulating the concentration of PPi in the mitochondrial matrix, it indirectly affects the activity of Ca²⁺ channels and intracellular calcium signaling.

The catalytic efficiency of this enzyme is strictly regulated by the concentration of Mg²⁺, and its hydrolytic activity forms a positive coupling with the ATP synthesis rate. This characteristic makes PPA2 a key molecular node connecting mitochondrial energy metabolism with various cellular activities, and its malfunction can directly lead to metabolic disorders in multiple systems.

Applications of PPA2 and PPA2 Antibody in Literature

1. Zhang, Xiang, et al. "SIRT5-mediated desuccinylation of PPA2 enhances HIF-1alpha-dependent adaptation to hypoxic stress and colorectal cancer metastasis." The EMBO Journal 44.9 (2025): 2514-2540. https://doi.org/10.1038/s44318-025-00416-1

The article indicates that in colorectal cancer, inorganic pyrophosphatase 2 (PPA2) activates the E3 ligase NEDD4 through dephosphorylation, promoting the non-classical ubiquitination degradation of HIF-1α and inhibiting glycolysis and metastasis. When hypoxia occurs, Sirtuin-5-mediated desuccinylation of PPA2 disrupts this mechanism, thereby enhancing the stability of HIF-1α and tumor metastasis. PPA2 has an anti-cancer effect.

2. Guimier, Anne, et al. "PPA2-associated sudden cardiac death: extending the clinical and allelic spectrum in 20 new families." Genetics in medicine 23.12 (2021): 2415-2425. https://doi.org/10.1038/s41436-021-01296-6

The article indicates that biallelic variations in the PPA2 gene can lead to impaired function of the mitochondrial enzymes encoded by it. Patients often present with sudden cardiac death or acute heart failure, with a high mortality rate. Alcohol may induce sudden death, and some survivors may experience neurological symptoms. This disease shows significant clinical and age heterogeneity.

3. Zhu, Wenbiao, et al. "Downregulation of PPA2 expression correlates with poor prognosis of kidney renal clear cell carcinoma." PeerJ 9 (2021): e12086. https://doi.org/10.7717/peerj.12086

The article indicates that the expression of PPA2 is significantly decreased in clear cell renal cell carcinoma tissues, and its low expression is closely related to high tumor grade and poor prognosis of patients. Studies have shown that PPA2 is an independent prognostic factor and may inhibit tumors by influencing epithelial-mesenchymal transition, thus becoming a potential prognostic biomarker.

4. Zhang, Jia-Ning, et al. "Multi-omics pan-cancer analysis reveals the prognostic values and immunological functions of PPA2, with a spotlight on breast cancer." Frontiers in Immunology 15 (2024): 1435502. https://doi.org/10.3389/fimmu.2024.1435502

The article indicates that PPA2 is abnormally expressed in various tumors, has significant prognostic value, and is associated with immune characteristics. Studies have confirmed that PPA2 plays a promoting role in breast cancer and can facilitate tumor progression. This study reveals the potential of PPA2 in pan-cancer, which can serve as a potential guide for immunotherapy and a therapeutic target for breast cancer.

5. Phoon, Colin KL, et al. "Sudden unexpected death in asymptomatic infants due to PPA2 variants." Molecular Genetics & Genomic Medicine 8.1 (2020): e1008. https://doi.org/10.1002/mgg3.1008

The article indicates that biallelic variations of the PPA2 gene can lead to sudden death in children. Two asymptomatic young children died unexpectedly at about one year old. Molecular autopsies revealed that they carried a compound heterozygous variant of PPA2. This gene encodes mitochondrial inorganic pyrophosphatase. Its dysfunction can disrupt myocardial energy metabolism and cause fatal heart problems, broadening the clinical understanding of this gene mutation.

Creative Biolabs: PPA2 Antibodies for Research

Creative Biolabs specializes in the production of high-quality PPA2 antibodies for research and industrial applications. Our portfolio includes monoclonal antibodies tailored for ELISA, Flow Cytometry, Western blot, immunohistochemistry, and other diagnostic methodologies.

Custom PPA2 Antibody Development: Tailor-made solutions to meet specific research requirements.
Bulk Production: Large-scale antibody manufacturing for industry partners.
Technical Support: Expert consultation for protocol optimization and troubleshooting.
Aliquoting Services: Conveniently sized aliquots for long-term storage and consistent experimental outcomes.

For more details on our PPA2 antibodies, custom preparations, or technical support, contact us at email.

Reference

Phoon, Colin KL, et al. "Sudden unexpected death in asymptomatic infants due to PPA2 variants." Molecular Genetics & Genomic Medicine 8.1 (2020): e1008. https://doi.org/10.1002/mgg3.1008