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Expression and functional characterisation of a soluble form of Tomato yellow leaf curl virus coat protein
Author(s) -
Wang LanLan,
Wei XueMei,
Ye XiaoDong,
Xu HongXing,
Zhou XuePing,
Liu ShuSheng,
Wang XiaoWei
Publication year - 2014
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.3750
Subject(s) - tomato yellow leaf curl virus , biology , midgut , whitefly , begomovirus , geminiviridae , virus , virology , plant virus , botany , larva
BACKGROUND Tomato yellow leaf curl virus ( TYLCV ), a member of the genus Begomovirus within the family Geminiviridae , is an important pathogen of tomato in many tropical, subtropical and temperate regions. TYLCV is exclusively transmitted by the whitefly Bemisia tabaci in a circulative manner. The viral coat protein ( CP ) has been assumed to play important roles in the entry of TYLCV into the insect midgut cells. RESULTS Testing the hypothesis that CP plays an important role in TYLCV acquisition by B. tabaci , a soluble form of the CP was expressed and purified. The purified recombinant CP made it possible to examine the function of TYLCV CP without other viral proteins. In an in vivo binding assay, specific binding of TYLCV CP to B. tabaci midguts was detected when purified CP was fed to B. tabaci . In addition, real‐time polymerase chain reaction analysis of virus titre revealed that B. tabaci fed with purified CP had reduced the level of virus in their midgut compared with those fed with bovine serum albumin or maltose‐binding protein. These results suggest that binding of TYLCV CP to the B. tabaci midgut specifically inhibits virus acquisition. CONCLUSIONS The findings that TYLCV CP binds to B. tabaci midguts and decreases virus acquisition provide direct evidence that CP mediates the attachment of TYLCV to receptors on the epithelial cells of the B. tabaci midgut. © 2014 Society of Chemical Industry