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Notechis scutatus

ABSTRACT: Notechis scutatus overview

PROVIDER: PRJNA170218 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR519122_1.fastq.gz	Fastqsanger.gz
	SRR519122_2.fastq.gz	Fastqsanger.gz
	SRR519464_1.fastq.gz	Fastqsanger.gz
	SRR519464_2.fastq.gz	Fastqsanger.gz

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Dissociation of lethal toxicity and enzymic activity of notexin from Notechis scutatus scutatus (Australian-tiger-snake) venom by modification of tyrosine residues.

Project description:Notexin from Notechis scutatus scutatus snake venom was subjected to tyrosine modification with p-nitrobenzenesulphonyl fluoride (NBSF), and four modified derivatives were separated by h.p.l.c. The results of amino acid analysis and sequence determination revealed that only Tyr-7, Tyr-70 and Tyr-77 were modified in notexin. Modification of Tyr-7 resulted in decreases in lethal toxicity and enzymic activity by 70.2% and 22.7% respectively. Conversely, modification of Tyr-77 caused a 1.8-fold increase in enzymic activity, in contrast with the loss of 52.5% of lethality. A drastic decrease in lethal toxicity was observed when both Tyr-7 and Tyr-70 were modified, whereas the enzymic activity decreased by only 35.8%. Likewise, the derivative in which Tyr-7 and Tyr-77 were modified retained 44.4% of enzymic activity, but showed a marked decrease in lethal toxicity. It is obvious that modification of tyrosine residues causes a decrease in lethal toxicity of notexin, which does not directly correlate with the change in enzymic activity. On the other hand, the antigenicity of NBS derivatives remained unchanged. The modified derivatives retained their affinity for Ca2+, indicating that the modified tyrosine residues did not participate in Ca2+ binding. These results indicate that modification of tyrosine residues can differentially influence the enzymic activity and lethal toxicity of notexin, and suggest that notexin might possess two functional sites, one being responsible for the catalytic activity and the other associated with its lethal effect.

| S-EPMC1130516 | biostudies-other

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