Characterization of a novel third member of the human cytomegalovirus glycoprotein H-glycoprotein L complex.

Abstract:

:A prerequisite for understanding the molecular function of the human cytomegalovirus (HCMV) gH (UL75)-gL (UL115) complex is a detailed knowledge of the structure of this complex in its functional form, as it is present in mature virions. The gH protein is known to be a component of a 240-kDa envelope complex designated as gCIII (D. R. Gretch, B. Kari, L. Rasmussen, R. C. Gehrz, and M. F. Stinski, J. Virol. 62:875-881, 1988). However, the exact composition of the gCIII complex remains unknown. In this report, we attempted reconstitution of the gCIII complex by coexpression of gH and gL in the baculovirus expression system. Formation of recombinant gH-gL complexes of approximately 115 kDa was demonstrated; however, no higher-molecular-mass (approximately 240-kDa) recombinant gH-gL complexes were detected, suggesting that the presence of gH and gL alone is not sufficient for reconstitution of the gCIII complex. To identify other mammalian and/or HCMV factors which may be necessary for gCIII formation, immunoprecipitates of gH and gL from HCMV-infected fibroblasts and purified HCMV virions were examined. This analysis did reveal a number of coprecipitating proteins which associate either transiently or integrally with gH and gL. One coprecipitating protein of 145 kDa was shown to be an integral component of gCIII, along with gH and gL. Characterization of the 145-kDa protein demonstrates that it is structurally and antigenically unrelated to gH and gL and that it appears to be virally encoded. Together, these data indicate that the 145-kDa protein is a third novel component of the mature HCMV gH-gL complex.

journal_name

J Virol

journal_title

Journal of virology

authors

Huber MT,Compton T

doi

10.1128/JVI.71.7.5391-5398.1997

subject

Has Abstract

pub_date

1997-07-01 00:00:00

pages

5391-8

issue

7

eissn

0022-538X

issn

1098-5514

journal_volume

71

pub_type

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