Extended binding sites of cyclophilin as revealed by the interaction with HIV‐1 Gag polyprotein derived oligopeptides
Extended binding sites of cyclophilin as revealed by the interaction with HIV‐1 Gag polyprotein derived oligopeptides
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通过与 HIV-1 Gag 多蛋白衍生寡肽的相互作用揭示了亲环蛋白的扩展结合位点
DOI:
10.1016/0014-5793(96)00972-6
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发表时间:
1996
期刊:
影响因子:
3.5
通讯作者:
G. Fischer
中科院分区:
文献类型:
--
作者:
M. Schutkowski;M. Drewello;Steffen Wöllner;M. Jakob;U. Reimer;G. Scherer;A. Schierhorn;G. Fischer
Oligopeptides derived from the gag polyprotein (Pr55gag) of human immunodeficiency virus type 1 (HIV‐1) segment were used to evaluate the extension of the putative binding region for the complex of Pr55gagand the human cytosolic peptidyl prolylcisltransisomerase (PPIase) 18 kDa cyclophilin (Cyp18). Five N‐terminally acetylated, C‐terminally amidated oligopeptides containing one (HIV‐1 Gag218–224; 1), two (HIV‐1 Gag218–226and HIV‐1 Gag217−224; 2 and 3, respectively), three (HIV‐1 Gag217–226; 4) or four (HIV‐1 Gag213−237; 5) proline residues were synthesized. Using competition experiments with a standard substrate the binding affinities to Cyp18 of the synthesized peptides were determined. The IC50value of 184 μ.M for the 25‐mer peptide 5 was fivefold or more lower than those of the peptides 1–4 lacking one or more prolines. Failure of competition in assays containing enzymes of other PPIase families by millimolar concentrations of 5 revealed a Cyp18 specific interaction involving the active site of the enzyme. In its far UV circular dichroism, aqueous solutions of 5 display properties of random coil conformation, but spectra were also consistent with a small contribution of proline specific secondary structures. However, a proline‐rich peptide typical of forming left‐handed polyproline II helices did not compete for the active site of Cyp18. The results demonstrate that the putative binding region of HIV‐1 gag polyprotein has a certain degree of binding affinity to the PPIase site of Cyp18, and may add a previously unrecognized topological component to the known subsite specificity of cyclophilins.
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DOI:
10.1111/j.1399-3011.1991.tb01523.x
发表时间:
1991
期刊:
International journal of peptide and protein research
影响因子:
--
作者:
Loomis,RE;Gonzalez,M;Loomis,PM
通讯作者:
Loomis,PM
影响因子:
56.9
作者:
FENG, SB;CHEN, JK;SCHREIBER, SL
通讯作者:
SCHREIBER, SL
影响因子:
2.9
作者:
J. Kofron;P. Kuzmič;V. Kishore;Esther Colon-Bonilla;D. Rich
通讯作者:
J. Kofron;P. Kuzmič;V. Kishore;Esther Colon-Bonilla;D. Rich
DOI:
10.1042/bj3150833
发表时间:
1996
期刊:
The Biochemical journal
影响因子:
--
作者:
O'Neal,KD;Chari,MV;Mcdonald,CH;Cook,RG;Yu-Lee,LY;Morrisett,JD;Shearer,WT
通讯作者:
Shearer,WT
影响因子:
4.4
作者:
Sherman,SA;Gmeiner,WH;Kirnarskiy,L;Perini,F;Ruddon,RW
通讯作者:
Ruddon,RW