Journal of Microbiology

Research Support, Non-U.S. Gov't

Studies on Synonymous Codon and Amino Acid Usage Biases in the Broad-Host Range Bacteriophage KVP40: Keya Sau , Sanjib Kumar Gupta , Subrata Sau , Subhas Chandra Mandal , Tapash Chandra Ghosh; J. Microbiol. 2007;45(1):58-63.; DOI: https://doi.org/2490 [pii]

Abstract: In this study, the relative synonymous codon and amino acid usage biases of the broad-host range phage, KVP40, were investigated in an attempt to understand the structure and function of its proteins/proteincoding genes, as well as the role of its tRNAs. Synonymous codons in KVP40 were determined to be ATrich at the third codon positions, and their variations are dictated principally by both mutational bias and translational selection. Further analysis revealed that the RSCU of KVP40 is distinct from that of its Vibrio hosts, V. cholerae and V. parahaemolyticus. Interestingly, the expression of the putative highly expressed genes of KVP40 appear to be preferentially influenced by the abundant host tRNA species, whereas the tRNAs expressed by KVP40 may be required for the efficient synthesis of all its proteins in a diverse array of hosts. The data generated in this study also revealed that KVP40 proteins are rich in low molecular weight amino acid residues, and that these variations are influenced primarily by hydropathy, mean molecular weight, aromaticity, and cysteine content.

cDNA cloning and expresion of human rotavirus outer capsid protein VP4: Kang, Seok W. , Yang, Jai M.; J. Microbiol. 1998;36(3):214-221.

Abstract: cDNA for the VP4-coding RNA segment 4 of human rotavirus isolated from Korean patients Was synthesized and cloned (HRV-k41), and its nucleotide sequence was determined. Comparative analysis of the nucleotide sequence of JRV-k41 showed 90.6%, 86.6%, 74.6%, 66%, 70.1% and 65.4% homology to P1A[8](Wa), P1B[4](RV5), P2[6](1076), P3[9](AU1), P4[10](69M), and P[14](PA169) genotypes respectively. The deduced amino acid sequence homology of HRV-k41 to P1A[8](Wa), P1B[4](RV5), P2[6](1076), P3[9](AU1), P4[10](69M), and P[14](PA169) genotypes respectively. The deduced amino acid sequence homology of HRV-k41 to P1A[8](Wa), P1B[4](RV5), P2[6](1076), P3[9](AU1), P4[10](69M) and P[14](169) was 92.9% 89.7%. 75.8%, 64.1%, 70.6% and 64.3% respectively. These results suggest that HRV-k41 is closely related to the P1A genotype. Two trypsin cleavage sites (arginine 240 and arginine 246) and four cysteine residues (215, 317, 379, and 773) conserved in VP4 of all rotavirus strains were also found in JRV-k41. Similar to other virulent human rotaviruses, an additional trypsin cleavage site(lysine 245) was also detected in this strain. The cDNA of the VP4-coding RNA segment was cloned into pGEX-4T-3, an Escherichia coli expression vector, and it's expression was confirmed by Western-blot analysis.

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