SHEET SHEET VI CORRESPONDS TO SHEET C2 (POSSIBLY FOR PSI2) OF PROTEIN DATA BANK ENTRY *2APR* ...SHEET SHEET VI CORRESPONDS TO SHEET C2 (POSSIBLY FOR PSI2) OF PROTEIN DATA BANK ENTRY *2APR* (RHIZOPUSPEPSIN, A SIMILAR ASPARTYL PROTEINASE). IN PEPSIN THIS SHEET HAS ONE MORE STRAND. THE EXTENDED SHEET VII CORRESPONDS TO SHEETS C1 (POSSIBLY BECAUSE OF PSI1) AND BIFURCATED SHEET 4A OF *2APR**. THE EXTENDED SHEET DESCRIPTION WAS USED IN THIS ENTRY BECAUSE THERE ARE THREE GOOD HYDROGEN BONDS BETWEEN STRANDS 3 AND 4. THE OVERALL STRUCTURE IS WELL CONSERVED BETWEEN THE TWO ENZYMES AS WELL AS AMONG OTHER FUNGAL PROTEINASES (PENNICILLOPEPSIN AND ENDOTHIAPEPSIN).
1: THE ELECTRON DENSITY FOR RESIDUES 292 - 296 IS WEAK IN THE FINAL MAP, INDICATING HIGH MOBILITY AND/OR DISORDER. THE CONFORMATION FOR THESE RESIDUES SHOULD BE CONSIDERED AS TENTATIVE. THE ELECTRON ...1: THE ELECTRON DENSITY FOR RESIDUES 292 - 296 IS WEAK IN THE FINAL MAP, INDICATING HIGH MOBILITY AND/OR DISORDER. THE CONFORMATION FOR THESE RESIDUES SHOULD BE CONSIDERED AS TENTATIVE. THE ELECTRON DENSITY IS ALSO WEAK FOR RESIDUES IN THE TURN ASP 278 - SER 281. 2: RESIDUE PRO 23 IS A CIS PROLINE.
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要素
#1: タンパク質
PEPSIN
分子量: 34514.492 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Sus scrofa (ブタ) / 参照: UniProt: P00791, pepsin A
pH: 2 / 手法: unknown 詳細: Andreeva, N.S. et al (1984). J. Biol. Chem., 259, 11353-11365.
溶液の組成
*PLUS
ID
濃度
一般名
Crystal-ID
Sol-ID
1
20 %
enzyme
1
1
2
20 %
ethanol
1
1
3
2.5M
sulfuricacid
1
1
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データ収集
反射
*PLUS
最高解像度: 2.3 Å / 最低解像度: 5 Å / Num. obs: 8742 / % possible obs: 77 % / Rmerge(I) obs: 0.145
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解析
ソフトウェア
名称: PROLSQ / 分類: 精密化
精密化
解像度: 2.3→5 Å 詳細: THE DENSITY FOR HOH 757 IS ELONGATED AND ITS SHAPE COULD VERY WELL CORRESPOND TO AN ETHANOL MOLECULE (EOH 901). THE SAME IS TRUE FOR HOH 694 (EOH 902). THUS THIS ENTRY CONTAINS TENTATIVE ...詳細: THE DENSITY FOR HOH 757 IS ELONGATED AND ITS SHAPE COULD VERY WELL CORRESPOND TO AN ETHANOL MOLECULE (EOH 901). THE SAME IS TRUE FOR HOH 694 (EOH 902). THUS THIS ENTRY CONTAINS TENTATIVE COORDINATES FOR TWO WELL-DEFINED ETHANOL MOLECULES IN THE VICINITY OF THE ACTIVE SITE (CORRESPONDING TO THESE TWO WATER MOLECULES). A THIRD, WEAKER, ETHANOL COULD BE HYDROGEN BONDED TO ASP 32 BUT THE DENSITY IS NOT UNEQUIVOCAL. THIS ETHANOL WOULD COMPRISE WATERS 452, 752, AND 756. APPROXIMATELY 10 PER CENT OF THE SOLVENT MOLECULES ARE PROBABLY ETHANOL MOLECULES. THE SPACE GROUP SETTING USED IN THIS ANALYSIS IS THE FIRST SETTING FOR MONOCLINIC SPACE GROUPS, WITH THE Z AXIS AS THE UNIQUE AXIS. FOR DETAILS PLEASE CONSULT THE INTERNATIONAL TABLES FOR X-RAY CRYSTALLOGRAPHY. THE ELECTRON DENSITY FOR RESIDUES 292 - 296 IS WEAK IN THE FINAL MAP, INDICATING HIGH MOBILITY AND/OR DISORDER. THE CONFORMATION FOR THESE RESIDUES SHOULD BE CONSIDERED AS TENTATIVE. THE ELECTRON DENSITY IS ALSO WEAK FOR RESIDUES IN THE TURN ASP 278 - SER 281.