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1qo5, resolution 2.50Å ()
Activity: Fructose-bisphosphate aldolase, with EC number
Related: 1ald
Resources: FirstGlance, OCA, RCSB, PDBsum
Coordinates: save as pdb, mmCIF, xml



Publication Abstract from PubMed

The X-ray crystallographic structure of the human liver isozyme of fructose-1,6-bisphosphate aldolase has been determined by molecular replacement using a tetramer of the human muscle isozyme as a search model. The liver aldolase (B isozyme) crystallized in space group C2, with unit-cell parameters a = 291.1, b = 489.8, c = 103.4 A, alpha = 90, beta = 103.6, gamma = 90 degrees. These large unit-cell parameters result from the presence of 18 subunits in the asymmetric unit: four catalytic tetramers and a dimer from a fifth tetramer positioned on the twofold crystallographic axis. This structure provides further insight into the factors affecting isozyme specificity. It reveals small differences in secondary structure that occur in regions previously determined to be isozyme specific. Two of these regions are at the solvent-exposed enzyme surface away from the active site of the enzyme. The most significant changes are in the flexible C-terminal region of the enzyme, where there is an insertion of an extra alpha-helix. Point mutations of the human liver aldolase are responsible for the disease hereditary fructose intolerance. Sequence information is projected onto the new crystal structure in order to indicate how these mutations bring about reduced enzyme activity and affect structural stability.

The structure of human liver fructose-1,6-bisphosphate aldolase., Dalby AR, Tolan DR, Littlechild JA, Acta Crystallogr D Biol Crystallogr. 2001 Nov;57(Pt 11):1526-33. Epub 2001, Oct 25. PMID:11679716

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.


[ALDOB_HUMAN] Defects in ALDOB are the cause of hereditary fructose intolerance (HFI) [MIM:229600]. HFI is an autosomal recessive disease that results in an inability to metabolize fructose and related sugars. Complete exclusion of fructose results in dramatic recovery; however, if not treated properly, HFI subjects suffer episodes of hypoglycemia, general ill condition, and risk of death the remainder of life.[1][2][3][4][5][6][7][8][9][10]

About this Structure

1qo5 is a 18 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA.

See Also


  • Dalby AR, Tolan DR, Littlechild JA. The structure of human liver fructose-1,6-bisphosphate aldolase. Acta Crystallogr D Biol Crystallogr. 2001 Nov;57(Pt 11):1526-33. Epub 2001, Oct 25. PMID:11679716
  1. Santamaria R, Esposito G, Vitagliano L, Race V, Paglionico I, Zancan L, Zagari A, Salvatore F. Functional and molecular modelling studies of two hereditary fructose intolerance-causing mutations at arginine 303 in human liver aldolase. Biochem J. 2000 Sep 15;350 Pt 3:823-8. PMID:10970798
  2. Cross NC, Tolan DR, Cox TM. Catalytic deficiency of human aldolase B in hereditary fructose intolerance caused by a common missense mutation. Cell. 1988 Jun 17;53(6):881-5. PMID:3383242
  3. Cross NC, de Franchis R, Sebastio G, Dazzo C, Tolan DR, Gregori C, Odievre M, Vidailhet M, Romano V, Mascali G, et al.. Molecular analysis of aldolase B genes in hereditary fructose intolerance. Lancet. 1990 Feb 10;335(8685):306-9. PMID:1967768
  4. Brooks CC, Tolan DR. A partially active mutant aldolase B from a patient with hereditary fructose intolerance. FASEB J. 1994 Jan;8(1):107-13. PMID:8299883
  5. Ali M, Sebastio G, Cox TM. Identification of a novel mutation (Leu 256-->Pro) in the human aldolase B gene associated with hereditary fructose intolerance. Hum Mol Genet. 1994 Jan;3(1):203-4. PMID:8162030
  6. Cross NC, Stojanov LM, Cox TM. A new aldolase B variant, N334K, is a common cause of hereditary fructose intolerance in Yugoslavia. Nucleic Acids Res. 1990 Apr 11;18(7):1925. PMID:2336380
  7. Lau J, Tolan DR. Screening for hereditary fructose intolerance mutations by reverse dot-blot. Mol Cell Probes. 1999 Feb;13(1):35-40. PMID:10024431 doi:S0890-8508(98)90208-0
  8. Sanchez-Gutierrez JC, Benlloch T, Leal MA, Samper B, Garcia-Ripoll I, Feliu JE. Molecular analysis of the aldolase B gene in patients with hereditary fructose intolerance from Spain. J Med Genet. 2002 Sep;39(9):e56. PMID:12205126
  9. Esposito G, Santamaria R, Vitagliano L, Ieno L, Viola A, Fiori L, Parenti G, Zancan L, Zagari A, Salvatore F. Six novel alleles identified in Italian hereditary fructose intolerance patients enlarge the mutation spectrum of the aldolase B gene. Hum Mutat. 2004 Dec;24(6):534. PMID:15532022 doi:10.1002/humu.9290
  10. Santer R, Rischewski J, von Weihe M, Niederhaus M, Schneppenheim S, Baerlocher K, Kohlschutter A, Muntau A, Posselt HG, Steinmann B, Schneppenheim R. The spectrum of aldolase B (ALDOB) mutations and the prevalence of hereditary fructose intolerance in Central Europe. Hum Mutat. 2005 Jun;25(6):594. PMID:15880727 doi:10.1002/humu.9343

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