Aldolase

Aldolase Full Name

Aldolase

Aldolase Introduction

Aldolase, also known as fructose-1,6-bisphosphate aldolase, is a crucial enzyme in the carbohydrate metabolic pathways of living organisms. It primarily catalyzes the reversible cleavage of fructose-1,6-bisphosphate (FBP) into glyceraldehyde-3-phosphate (G3P) and dihydroxyacetone phosphate (DHAP). This reaction is a key step in the preparatory phase of glycolysis, converting a six‑carbon molecule that is not readily utilizable into two three‑carbon molecules that can enter the energy‑yielding phase of glycolysis. Conversely, during gluconeogenesis—the synthesis of glucose in the liver and kidneys—and in the Calvin cycle of plant photosynthesis, aldolase catalyzes the reverse reaction, condensing DHAP and G3P to form FBP, thereby promoting glucose or carbohydrate synthesis. In mammals, the three aldolase isozymes (ALDOA, ALDOB, ALDOC) are encoded by different genes and perform distinct physiological tasks based on their tissue distribution and catalytic properties. ALDOA is highly expressed primarily in muscle and embryonic tissues and is a classic glycolytic enzyme; ALDOB is mainly found in the liver, kidneys, and intestines, where it is essential for fructose metabolism; and ALDOC is specifically expressed in brain tissue.

Figure 1. The components involved in reactions catalyzed by FBA. (Source: Mathipa-Mdakane, M.G.et al. 2024)

In the field of cancer biology, metabolic reprogramming is recognized as a central hallmark of cancer. Among these changes, the shift toward aerobic glycolysis—known as the "Warburg effect"—provides key material and energy support for the rapid proliferation, survival, and metastasis of tumor cells. The Warburg effect refers to the preference of most cancer cells to metabolize glucose via glycolysis, producing large amounts of lactate, even under oxygen‑sufficient conditions, rather than through complete oxidation via mitochondrial oxidative phosphorylation. Within this metabolic framework, the role of ALDOA is critical. Numerous studies have confirmed that ALDOA is commonly overexpressed in various human malignancies, including but not limited to colorectal cancer, hepatocellular carcinoma, pancreatic cancer, lung cancer, esophageal cancer, and gastric cancer. High expression of ALDOA directly enhances the overall catalytic flux of the glycolytic pathway, driving the conversion of glucose to pyruvate and lactate. By accelerating the cleavage of FBP, ALDOA not only ensures rapid downstream ATP generation but also facilitates the efficient diversion of upstream metabolites into various biosynthetic pathways, thereby systematically supporting the malignant biological behavior of tumor cells.

Beyond its catalytic role, research has shown that ALDOA can interact with multiple cytoskeletal proteins, particularly actin. This interaction likely plays a part in maintaining cell structure, altering cell morphology, and regulating cell migration. In tumor cells, enhanced migratory and invasive abilities are prerequisites for metastasis. Through dynamic binding with the cytoskeleton, ALDOA may participate in the formation of cellular protrusions and the regulation of cell movement, thereby promoting tumor invasion and metastasis.

Alternate Names for Aldolase

ALDA; ALDOA; Aldolase A; Aldolase A fructose bisphosphatase; Aldolase A fructose bisphosphate; Lung cancer antigen NY LU 1; Fructose 1 6 bisphosphate triosephosphate lyase; Fructose bisphosphate aldolase A; Fructose bisphosphate aldolase; MGC10942

• 1. Mathipa-Mdakane, M.G.et al. Aldolase: A Desirable Biocatalytic Candidate for Biotechnological Applications. Catalysts 2024, 14, 114.
  2. Chang YC, et al. Roles of Aldolase Family Genes in Human Cancers and Diseases. Trends Endocrinol Metab. 2018 Aug;29(8):549-559.