SP‐40,40, a protein involved in the control of the complement pathway, possesses a unique array of disulphide bridges

FEBS Letters

Kirszbaum, L.¹  Walker, I.D.¹  Bozas, S.E.¹ 

[1]Biochemistry Unit, Department of Veterinary Sciences, The University of Melbourne, Parkville 3052, Australia

关键词: SP-40;    40;    Complement;    Disulphide bridge;    Protein sequencing;    Apolipoprotein A-I;    Sequence homology;    SGP-2;    sulphated glycoprotein-2;    HDL;    high density lipoproteins;    CHO;    Carbohydrate;    CNBr;    cyanogen bromide;    DTT;    dithiothreitol;    E:S;    enzyme:substrate;    TFA;    trifluoroacetic acid;    PAGE;    polyacrylamide gel electrophoresis;    SDS;    sodium dodecyl sulphate;   

DOI  :  10.1016/0014-5793(92)80330-J

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

SP-40,40 is a two-chain serum protein which acts in vitro as a potent inhibitor of the assembly of the membrane attack complex of human complement. It contains 10 cysteine residues, the numbers and locations of which are conserved in several mammalian species. Evidence is presented that all the cysteine residues are involved in interchain (α—β) disulphide bonds. There are no free cysteine residues. The disulphide bond motif established in this study for SP-40,40 is unique and bears no obvious homology to those complement components whose disulphide bonds have been assigned, nor is there any homology apparent between SP-40,40 and other multi-chain proteins containing disulphide bonds.

【 授权许可】

Unknown