1pp4 is a 2 chain structure with sequence from Aspergillus aculeatus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
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 glycoprotein rhamnogalacturonan acetylesterase from Aspergillus aculeatus has been crystallized in two crystal forms, an orthorhombic and a trigonal crystal form. In the orthorhombic crystal form, the covalently bound carbohydrate at one of the two N-glycosylation sites is involved in crystal contacts. The orthorhombic crystal form was obtained at pH 5.0 and the trigonal crystal form at pH 4.5. In one case, the two crystal forms were found in the same drop at pH 4.7. The differences in crystal packing in the two crystal forms can be explained by the pH-dependent variation in the protonation state of the glutamic acid residues on the protein surface.
Crystal packing in two pH-dependent crystal forms of rhamnogalacturonan acetylesterase.,Molgaard A, Larsen S Acta Crystallogr D Biol Crystallogr. 2004 Mar;60(Pt 3):472-8. Epub 2004, Feb 25. PMID:14993671[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
↑ Molgaard A, Larsen S. Crystal packing in two pH-dependent crystal forms of rhamnogalacturonan acetylesterase. Acta Crystallogr D Biol Crystallogr. 2004 Mar;60(Pt 3):472-8. Epub 2004, Feb 25. PMID:14993671 doi:10.1107/S0907444903029767
