The murine orthologue of human antichymotrypsin - A structural paradigm for CLADE A3 serpins

被引:96
作者
Horvath, AJ
Irving, JA
Rossjohn, J
Law, RH
Bottomley, SP
Quinsey, NS
Pike, RN
Coughlin, PB
Whisstock, JC
机构
[1] Monash Univ, Australian Ctr Blood Dis, Alfred Med Res Precinct, Prahran, Vic 3181, Australia
[2] Monash Univ, Prot Crystallog Unit, Monash Ctr Synchrotron Sci, Clayton, Vic 3800, Australia
[3] Monash Univ, Dept Biochem & Mol Biol, Sch Biomed Sci, Clayton, Vic 3800, Australia
[4] Monash Univ, Victorian Bioinformat Consortium, Clayton, Vic 3800, Australia
[5] Monash Univ, Australian Res Council Ctr Struct & Funct Microbi, Clayton, Vic 3800, Australia
基金
英国惠康基金;
关键词
D O I
10.1074/jbc.M505598200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Antichymotrypsin (SERPINA3) is a widely expressed member of the serpin superfamily, required for the regulation of leukocyte proteases released during an inflammatory response and with a permissive role in the development of amyloid encephalopathy. Despite its biological significance, there is at present no available structure of this serpin in its native, inhibitory state. We present here the first fully refined structure of a murine antichymotrypsin orthologue to 2.1 angstrom, which we propose as a template for other antichymotrypsin-like serpins. A most unexpected feature of the structure of murine serpina3n is that it reveals the reactive center loop (RCL) to be partially inserted into the A beta-sheet, a structural motif associated with ligand-dependent activation in other serpins. The RCL is, in addition, stabilized by salt bridges, and its plane is oriented at 90 to the RCL of antitrypsin. A biochemical and biophysical analysis of this serpin demonstrates that it is a fast and efficient inhibitor of human leukocyte elastase (k(a):4 +/- 0.9 x 10(6) M-1 s(-1)) and cathepsin G (ka: 7.9 +/- 0.9 x 10(5) M-1 s(-1)) giving a spectrum of activity intermediate between that of human antichymotrypsin and human antitrypsin. An evolutionary analysis reveals that residues subject to positive selection and that have contributed to the diversity of sequences in this sub-branch (A3) of the serpin superfamily are essentially restricted to the P-4 - P-6' region of the RCL, the distal hinge, and the loop between strands 4B and 5B.
引用
收藏
页码:43168 / 43178
页数:11
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