Journal of Microbiology

Chanvit Leelayuwat

2 Articles

Allelic MHC Class I Chain Related B (MICB) Molecules Affect the Binding to the Human Cytomegalovirus (HCMV) Unique Long 16 (UL16) Protein: Implications for Immune Surveillance: Kanya Klumkrathok , Amonrat Jumnainsong , Chanvit Leelayuwat; J. Microbiol. 2013;51(2):241-246. Published online April 27, 2013; DOI: https://doi.org/10.1007/s12275-013-2514-1

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Unique long 16 (UL16) is a viral glycoprotein produced in a host cell infected with human cytomegalovirus (HCMV). It down regulates surface expression of MICB, one of the NKG2D ligands, by forming stable intracellular complexes and retained in the endoplasmic reticulum. Down expression of MICB renders cells less susceptible to NK cell lysis via the NKG2D receptor. Diverse UL16 sequences were identified from different strains of HCMV. MICB is known to be polymorphic. It is not known whether these polymorphisms affect the interactions between these molecules leading to alteration of the immune surveillance of HCMV. The soluble Fc fusion variant UL16 proteins from four laboratory and clinical isolates (AD169, Toledo, PH, and TR) were produced. Four allelic MICB alleles (008, 003, 004, and 00502) were cloned and stable cell lines expressing these MICB alleles were produced. The binding activities of variant UL16 to allelic MICB proteins were determined by flow cytometry. The variants of UL16 proteins did not affect the binding activities to allelic MICB proteins. However, diverse MICB alleles differentially bound UL16. We found that MICB*008 which contains methionine and asparagine at the amino acid positions 98 and 113, respectively, in the alpha 2 domain showed decreased binding activities to UL16 when compared to MICB*003, 004, and MICB*00502 containing isoleucine and aspartic acid, respectively. This finding may imply that MICB*008 is a protective allele and involved in the immune surveillance of HCMV infected patients.

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Effect of Acidic pH on the Invasion Efficiency and the Type III Secretion System of Burkholderia thailandensis: Siroj Jitprasutwit , Wisansanee Thaewpia , Veerachat Muangsombut , Aroonlug Lulitanond , Chanvit Leelayuwat , Ganjana Lertmemongkolchai , Sunee Korbsrisate; J. Microbiol. 2010;48(4):526-532. Published online August 20, 2010; DOI: https://doi.org/10.1007/s12275-010-0078-x

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Abstract PDF

Burkholderia thailandensis is a close relative of Burkholderia pseudomallei. These organisms are very similar, but B. thailandensis is far less virulent than B. pseudomallei. Nucleotide sequencing and analysis of 14 B. thailandensis isolates revealed variation in the regions coding for the type III secreted BipD protein. The degree of B. thailandensis BipD sequence variation was greater than that found in B. pseudomallei. Western blot analysis indicated that, unlike B. pseudomallei, B. thailandensis type III secreted proteins including BipD and BopE could not be detected in the supernatant of culture medium unless induced by acidic conditions. In addition, culturing B. thailandensis under acidic growth conditions (pH 4.5) can induce the ability of this bacterium to invade human respiratory epithelial cells A549. The identification of an environmental stimulus that increases the invasion capability of B. thailandensis invasion is of value for those who would like to use this bacterium as a model to study B. pseudomallei virulence.

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