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TitleCrystal structures and small-angle x-ray scattering analysis of UDP-galactopyranose mutase from the pathogenic fungus Aspergillus fumigatus.
Journal, issue, pagesJ Biol Chem, Vol. 287, Issue 12, Page 9041-9051, Year 2012
Publish dateMar 16, 2012
AuthorsRicha Dhatwalia / Harkewal Singh / Michelle Oppenheimer / Dale B Karr / Jay C Nix / Pablo Sobrado / John J Tanner /
PubMed AbstractUDP-galactopyranose mutase (UGM) is a flavoenzyme that catalyzes the conversion of UDP-galactopyranose to UDP-galactofuranose, which is a central reaction in galactofuranose biosynthesis. ...UDP-galactopyranose mutase (UGM) is a flavoenzyme that catalyzes the conversion of UDP-galactopyranose to UDP-galactofuranose, which is a central reaction in galactofuranose biosynthesis. Galactofuranose has never been found in humans but is an essential building block of the cell wall and extracellular matrix of many bacteria, fungi, and protozoa. The importance of UGM for the viability of many pathogens and its absence in humans make UGM a potential drug target. Here we report the first crystal structures and small-angle x-ray scattering data for UGM from the fungus Aspergillus fumigatus, the causative agent of aspergillosis. The structures reveal that Aspergillus UGM has several extra secondary and tertiary structural elements that are not found in bacterial UGMs yet are important for substrate recognition and oligomerization. Small-angle x-ray scattering data show that Aspergillus UGM forms a tetramer in solution, which is unprecedented for UGMs. The binding of UDP or the substrate induces profound conformational changes in the enzyme. Two loops on opposite sides of the active site move toward each other by over 10 Å to cover the substrate and create a closed active site. The degree of substrate-induced conformational change exceeds that of bacterial UGMs and is a direct consequence of the unique quaternary structure of Aspergillus UGM. Galactopyranose binds at the re face of the FAD isoalloxazine with the anomeric carbon atom poised for nucleophilic attack by the FAD N5 atom. The structural data provide new insight into substrate recognition and the catalytic mechanism and thus will aid inhibitor design.
External linksJ Biol Chem / PubMed:22294687 / PubMed Central
MethodsSAS (X-ray synchrotron) / X-ray diffraction
Resolution2.25 - 2.35 Å
Structure data

SASDDK2:
Aspergillus fumigatus UDP galactopyranose mutase
Method: SAXS/SANS

PDB-3ute:
Crystal structure of Aspergillus fumigatus UDP galactopyranose mutase sulfate complex
Method: X-RAY DIFFRACTION / Resolution: 2.35 Å

PDB-3utf:
Crystal structure of Aspergillus fumigatus UDP galactopyranose mutase in reduced state
Method: X-RAY DIFFRACTION / Resolution: 2.25 Å

PDB-3utg:
Crystal structure of Aspergillus fumigatus UDP galactopyranose mutase complexed with UDP in reduced state
Method: X-RAY DIFFRACTION / Resolution: 2.25 Å

PDB-3uth:
Crystal structure of Aspergillus fumigatus UDP galactopyranose mutase complexed with substrate UDP-Galp in reduced state
Method: X-RAY DIFFRACTION / Resolution: 2.25 Å

Chemicals

ChemComp-FAD:
FLAVIN-ADENINE DINUCLEOTIDE / FAD*YM / Flavin adenine dinucleotide

ChemComp-SO4:
SULFATE ION / Sulfate

ChemComp-ACT:
ACETATE ION / Acetate

ChemComp-GOL:
GLYCEROL / Glycerol

ChemComp-HOH:
WATER / Water

ChemComp-FDA:
DIHYDROFLAVINE-ADENINE DINUCLEOTIDE

ChemComp-UDP:
URIDINE-5'-DIPHOSPHATE / UDP*YM / Uridine diphosphate

ChemComp-GDU:
GALACTOSE-URIDINE-5'-DIPHOSPHATE

Source
  • aspergillus fumigatus (mold)
KeywordsISOMERASE / Nucleotide binding / Mutase / Flavin adenine dinucleotide binding

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