1cer | pdb_00001cer

DETERMINANTS OF ENZYME THERMOSTABILITY OBSERVED IN THE MOLECULAR STRUCTURE OF THERMUS AQUATICUS D-GLYCERALDEHYDE-3-PHOSPHATE DEHYDROGENASE AT 2.5 ANGSTROMS RESOLUTION

spinqualitylabelsall models 1cer, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1cer is a 8 chain structure with sequence from Thermus aquaticus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NAD Gene: THERMUS AQUATICUS GAPDH (Thermus aquaticus) Activity: Glyceraldehyde-3-phosphate dehydrogenase (phosphorylating), with EC number 1.2.1.12 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The crystal structure of holo D-glyceraldehyde-3-phosphate dehydrogenase (GAPDH) from the extreme thermophile Thermus aquaticus has been solved at 2.5 Angstroms resolution. To study the determinants of thermostability, we compare our structure to four other GAPDHs. Salt links, hydrogen bonds, buried surface area, packing density, surface to volume ratio, and stabilization of alpha-helices and beta-turns are analyzed. We find a strong correlation between thermostability and the number of hydrogen bonds between charged side chains and neutral partners. These charged-neutral hydrogen bonds provide electrostatic stabilization without the heavy desolvation penalty of salt links. The stability of thermophilic GAPDHs is also correlated with the number of intrasubunit salt links and total hydrogen bonds. Charged residues, therefore, play a dual role in stabilization by participating not only in salt links but also in hydrogen bonds with a neutral partner. Hydrophobic effects allow for discrimination between thermophiles and psychrophiles, but not within the GAPDH thermophiles. There is, however, an association between thermostability and decreasing enzyme surface to volume ratio. Finally, we describe several interactions present in both our GAPDH and a hyperthermophilic GAPDH that are absent in the less thermostable GAPDHs. These include a four-residue salt link network, a hydrogen bond near the active site, an intersubunit salt link, and several buried Ile residues. Determinants of enzyme thermostability observed in the molecular structure of Thermus aquaticus D-glyceraldehyde-3-phosphate dehydrogenase at 25 Angstroms Resolution.,Tanner JJ, Hecht RM, Krause KL Biochemistry. 1996 Feb 27;35(8):2597-609. PMID:8611563 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Glyceraldehyde-3-Phosphate Dehydrogenase

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