Catalyzes the reversible conversion of ribose-5-phosphate to ribulose 5-phosphate and participates in the first step of the non-oxidative branch of the pentose phosphate pathway

Ribose 5-phosphate isomerase deficiency

An autosomal recessive inborn error of polyols metabolism characterized by highly elevated level of ribitol and arabitol in brain and body fluids. Clinical features include leukoencephalopathy, psychomotor retardation from early life, neurologic regression, and a mild sensorimotor neuropathy.

Catalyzes the rate-limiting step of the oxidative pentose-phosphate pathway, which represents a route for the dissimilation of carbohydrates besides glycolysis. The main function of this enzyme is to provide reducing power (NADPH) and pentose phosphates for fatty acid and nucleic acid synthesis. Also catalyzes the conversion of NAADPH, which is produced by enzymes such as DUOX1, DUOX2 and NOX5 from NAADP and promotes Ca(2+) signaling during T cell activation, back to NAADP (PubMed:34784249)

Cytoplasm, cytosolMembrane

Anemia, congenital, non-spherocytic hemolytic, 1

An X-linked disease characterized by G6PD deficiency, acute hemolytic anemia, fatigue, back pain, and jaundice. In most patients, the disease is triggered by an exogenous agent, such as some drugs, food, or infection. Increased unconjugated bilirubin, lactate dehydrogenase, and reticulocytosis are markers of the disorder. Although G6PD deficiency can be life-threatening, most patients are asymptomatic throughout their life.

Acts as a modulator of macrophage activation through control of glucose metabolism

Cytoplasm

Sedoheptulokinase deficiency

An autosomal recessive metabolic disease characterized by increased urinary erythritol and sedoheptulose. Neonatal cholestasis, hypoglycemia, anemia, congenital arthrogryposis multiplex, multiple contractures and dysmorphisms have been reported in SHPKD patients, but the relationship of these features to the SHPKD is unclear.

Catalyzes the NADPH-dependent reduction of several pentoses, tetroses, trioses, alpha-dicarbonyl compounds and L-xylulose (PubMed:11882650, PubMed:19337691, PubMed:40737316). Can use both NAD and NADP as cosubstrate but shows higher activity with NADP (PubMed:11882650). Participates in the uronate cycle of glucose metabolism (PubMed:11882650). May play a role in the water absorption and cellular osmoregulation in the proximal renal tubules by producing xylitol, an osmolyte, thereby preventing os

Apical cell membraneCytoplasmic vesicle, secretory vesicle, acrosome

Pentosuria

An inborn error of metabolism characterized by excessive urinary excretion of L-xylulose.

Tyrosine kinase involved in the regulation of tissues remodeling (PubMed:30449416). It functions as a cell surface receptor for fibrillar collagen and regulates cell differentiation, remodeling of the extracellular matrix, cell migration and cell proliferation. Required for normal bone development. Regulates osteoblast differentiation and chondrocyte maturation via a signaling pathway that involves MAP kinases and leads to the activation of the transcription factor RUNX2. Regulates remodeling of

Cell membrane

Spondyloepimetaphyseal dysplasia, short limb-hand type

A bone disease characterized by short-limbed dwarfism, a narrow chest with pectus excavatum, brachydactyly in the hands and feet, a characteristic craniofacial appearance and premature calcifications. The radiological findings are distinctive and comprise short long bones throughout the skeleton with striking epiphyses that are stippled, flattened and fragmented and flared, irregular metaphyses. Platyspondyly in the spine with wide intervertebral spaces is observed and some vertebral bodies are pear-shaped with central humps, anterior protrusions and posterior scalloping.

Catalyzes the rate-limiting step of the non-oxidative phase in the pentose phosphate pathway. Catalyzes the reversible conversion of sedheptulose-7-phosphate and D-glyceraldehyde 3-phosphate into erythrose-4-phosphate and beta-D-fructose 6-phosphate (PubMed:18687684, PubMed:8955144). Not only acts as a pentose phosphate pathway enzyme, but also affects other metabolite pathways by altering its subcellular localization between the nucleus and the cytoplasm (By similarity)

NucleusCytoplasm

Transaldolase deficiency

An inborn error of the pentose phosphate pathway resulting in early-onset multisystem disease. Clinical features include growth retardation, dysmorphic features, cutis laxa, congenital heart disease, hepatosplenomegaly, telangiectases of the skin, pancytopenia, and bleeding tendency.