Crystal structure of an uncleaved alpha 1-antitrypsin reveals the conformation of its inhibitory reactive loop.
The crystal structure of a recombinant human alpha 1-antitrypsin, in the uncleaved and uncomplexed state, has been determined by X-ray crystallographic methods and refined to an R-factor of 18.4% for 8.0-3.46 A data with good stereochemistry. This structure provides the first view at the inhibitory loop and the central beta-sheet A of the uncleaved alpha 1-antitrypsin. The reactive loop takes a distorted helical conformation and no pre-insertion of two residues in the reactive loop into the beta-sheet A is observed. The present structure is largely in agreement with the model predicted by Engh, Wright, and Huber [Prot. Eng. 3 (1990) 469-477].
Department of Chemistry, Seoul National University, South Korea.
H K
HK
Song
K N
KN
Lee
K S
KS
Kwon
M H
MH
Yu
S W
SW
Suh
D001665:Binding Sites; D018360:Crystallography, X-Ray; D006801:Humans; D008958:Models, Molecular; D011487:Protein Conformation; D011993:Recombinant Fusion Proteins / Q000737:chemistry; D000515:alpha 1-Antitrypsin / Q000737:chemistry*
D011993:Recombinant Fusion Proteins; D000515:alpha 1-Antitrypsin