Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 12.84 kDa 
• Atom Count: 971 
• Modelled Residue Count: 112 
• Deposited Residue Count: 116 
• Unique protein chains: 1

1AAP

X-RAY CRYSTAL STRUCTURE OF THE PROTEASE INHIBITOR DOMAIN OF ALZHEIMER'S AMYLOID BETA-PROTEIN PRECURSOR

• DOI: 10.2210/pdb1AAP/pdb

• Classification: PROTEINASE INHIBITOR (TRYPSIN)
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1990-09-14 Released: 1991-10-15 
• Deposition Author(s): Hynes, T.R., Randal, M., Kennedy, L.A., Eigenbrot, C., Kossiakoff, A.A.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Observed: 0.177 

Literature

X-ray crystal structure of the protease inhibitor domain of Alzheimer's amyloid beta-protein precursor.

Hynes, T.R., Randal, M., Kennedy, L.A., Eigenbrot, C., Kossiakoff, A.A.

(1990) Biochemistry 29: 10018-10022

• PubMed: 2125487 
• DOI: 10.1021/bi00495a002
• Primary Citation of Related Structures:  
  1AAP


• PubMed Abstract: 
  

Alzheimer's amyloid beta-protein precursor contains a Kunitz protease inhibitor domain (APPI) potentially involved in proteolytic events leading to cerebral amyloid deposition. To facilitate the identification of the physiological target of the inhibitor, the crystal structure of APPI has been determined and refined to 1.5-A resolution. Sequences in the inhibitor-protease interface of the correct protease target will reflect the molecular details of the APPI structure. While the overall tertiary fold of APPI is very similar to that of the Kunitz inhibitor BPTI, a significant rearrangement occurs in the backbone conformation of one of the two protease binding loops. A number of Kunitz inhibitors have similar loop sequences, indicating the structural alteration is conserved and potentially an important determinant of inhibitor specificity. In a separate region of the protease binding loops, APPI side chains Met-17 and Phe-34 create an exposed hydrophobic surface in place of Arg-17 and Val-34 in BPTI. The restriction this change places on protease target sequences is seen when the structure of APPI is superimposed on BPTI complexed to serine proteases, where the hydrophobic surface of APPI faces a complementary group of nonpolar side chains on kallikrein A versus polar side chains on trypsin.

---

Organizational Affiliation: 

Protein Engineering Department, Genentech Inc., South San Francisco, California 94080.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ALZHEIMER'S DISEASE AMYLOID A4 PROTEIN	A, B	58	Homo sapiens	Mutation(s): 0  Gene Names: APP, A4, AD1
Find proteins for P05067 (Homo sapiens) Explore P05067  Go to UniProtKB:  P05067
NIH Common Fund Data Resources
PHAROS:  P05067

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Observed: 0.177 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 35.6	α = 90
b = 38.9	β = 90
c = 73.6	γ = 90

Software Package:

Software Name	Purpose
PROLSQ	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1990-09-14 
• Released Date: 1991-10-15 
Deposition Author(s): Hynes, T.R., Randal, M., Kennedy, L.A., Eigenbrot, C., Kossiakoff, A.A.

Revision History  

• Version 1.0: 1991-10-15
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance