Cyclophilin A complexed with a fragment of HIV-1 gag protein: insights into HIV-1 infectious activity.
Cyclophilin A complexed with a fragment of HIV-1 gag protein: insights into HIV-1 infectious activity.
复制标题
亲环蛋白 A 与 HIV-1 gag 蛋白片段复合:深入了解 HIV-1 感染活性。
DOI:
10.1016/s0969-2126(97)00172-x
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发表时间:
1997
期刊:
影响因子:
--
通讯作者:
Ke,H
中科院分区:
文献类型:
--
作者:
Zhao,Y;Chen,Y;Schutkowski,M;Fischer,G;Ke,H
Background:Cyclophilin A (CyPA), a receptor of the immunosuppressive drug cyclosporin A, catalyzes thecis-transisomerization of peptidyl–prolyl bonds and is required for the infectious activity of human immunodeficiency virus type 1 (HIV-1). The crystal structure of CyPA complexed with a fragment of the HIV-1 gag protein should provide insights into the nature of CyPA–gag interactions and may suggest a role for CyPA in HIV-1 infectious activity.Results:The crystal structure of CyPA complexed with a 25 amino acid peptide of HIV-1 gag capsid protein (25-mer) was determined and refined to an R factor of 0.195 at 1.8 Å resolution. The sequence Ala88-Gly89-Pro90-Ile91 of the gag fragment is the major portion to bind to the active site of CyPA. Two residues of the 25-mer (Pro90-Ile91) bind to CyPA in a similar manner to two residues (Pro-Phe) of the CyPA substrate, succinyl-Ala-Ala-Pro-Phe-p-nitroanilide (AAPF). However, the N-terminus of the 25-mer (Ala88-Gly89) exhibits a different hydrogen-bonding pattern and molecular conformation than AAPF. The peptidyl–prolyl bond between Gly89 and Pro90 of the 25-mer has atransconformation, in contrast to thecisconformation observed in other known CyPA–peptide complexes. The residue preceding proline, Gly89, has an unfavorable backbone conformation usually only adopted by glycine.Conclusions:The unfavorable backbone conformation of Gly89 of the gag 25-mer fragment suggests that binding between HIV-1 gag protein and CyPA requires a special sequence, Gly-Pro. Thus, in HIV-1 infectivity, CyPA is likely to function as a chaperone, rather than as acis-transisomerase. However, the observation of similarities between the C termini of the 25-mer and the substrate AAPF means that the involvement of thecis-transisomerase activity of CyPA cannot be completely ruled out.
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DOI:
--
发表时间:
1989
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Davis,JM;Boswell,BA;Bächinger,HP
通讯作者:
Bächinger,HP
影响因子:
2.9
作者:
KIEFHABER, T;QUAAS, R;SCHMID, FX
通讯作者:
SCHMID, FX
影响因子:
3.5
作者:
M. Schutkowski;M. Drewello;Steffen Wöllner;M. Jakob;U. Reimer;G. Scherer;A. Schierhorn;G. Fischer
通讯作者:
G. Fischer
DOI:
10.1073/pnas.88.21.9483
发表时间:
1991-11-01
影响因子:
11.1
作者:
KE, HM;ZYDOWSKY, LD;WALSH, CT
通讯作者:
WALSH, CT
影响因子:
2.9
作者:
Kakalis,LT;Armitage,IM
通讯作者:
Armitage,IM