Fatemeh Kazemi-Lomedasht*, Delavar Shahbazzadeh and Mahdi Behdani
Venom & Biotherapeutics Molecules Laboratory, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
*Address for Correspondence: Fatemeh Kazemi-Lomedasht, Assistant Professor, Ph.D of Medical Biotechnology, Tehran, Iran, Tel: +98-021-66112529; Email: email@example.com
Dates: Submitted: 05 December 2018; Approved: 04 February 2019; Published: 05 February 2019
How to cite this article:Kazemi-Lomedasht F, Shahbazzadeh D, Behdani M. Phylogenetic analysis of metalloprotease from transcriptome of venom gland of Hemiscorpius lepturus. Arch Biotechnol Biomed. 2019; 3: 006-010. DOI: 10.29328/journal.abb.1001014
Copyright: © 2019 Kazemi-Lomedasht F, et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: Hemiscorpius lepturus; Venom component; Phylogeny; Metalloproteinases; Iranian scorpion
Hemiscorpius lepturusis a dangerous scorpion and referred to health concern issue in Khuzestan, Iran. The venom of H.lepturus is cytotoxic and its effect is similar to spider Loxosceles reclusa. Metalloproteinases are the important class of enzymes in the venom that has hemorrhagic activity. The early finding suggests the existence of metalloproteases in the transcriptome of venom gland of H.lepturus. Phylogenetic analysis was accomplished to reveal the evolutionary relationship of identified metalloproteases. The phylogenetic tree was constructed by Molecular Evolutionary Genetics Analysis software and neighbor-joining method. Results showed among three sequences, two metalloproteinases named HLMP1 and HLMP3 of H.lepturus were most close to spider P. tepidariorum. The third sequence named HLMP2 was different and formed an independent clade in the phylogenetic tree. The results suggest that the sequence of metalloproteases in the venom component of H.lepturus is similar to the spider than the scorpion.
Hemiscorpius lepturusis one of the dangerous scorpions of Iran. The pathological effects of H.lepturus are different of other scorpions and results in failure of kidney, liver as well as blood cells . Various studies have evaluated the venom component of H.lepturus and various toxic peptides and proteins of H.lepturus have been identified like: hemitoxin , hemicalcin , heminecrolysin  and hemilipin . Transcriptome analysis of venom gland of H.lepturus was performed in previous study and whole venom component of this scorpion was identified . Early finding of transcriptome analysis suggest existence of metalloprotease enzyme in the venom gland of H.lepturus [6,7]. However the metalloprotease activity of H.lepturus has been evaluated using zymography analysis . Matrix metalloproteinases (MMPs) play a role in growth and cell differentiation through direct and indirect mechanism on growth factors function [9-11]. It seems that MMP can affect cellular attachment to the matrix by proteolysis of the adhesion sites . In the early stage, MMP plays a role in cell proliferation and cell survival of tumor cells . There is diversity in function of various metalloproteinases of different organisms . Metalloproteases are important enzymes in the venom component. They play important role in hemorrhagic activity of venom . A metalloproteinase named, BumaMPs1, has been identified in the venom of Buthus martensi scorpion) . BumaMPs1 characterized as independent metalloproteinase of others . Phylogenetic analysis results showed that BumaMP1 is most similar to Mesobuthus eupeus scorpion metalloproteinase . Here, phylogenetic analysis of the metalloproteinase (identified in transcriptome of venom glnad) of H.lepturus was performed for the first time to identify evolutionary relationship of the enzyme in three different taxa: Insecta , Ophidia and Arachnida.
Materials and Methods
The transcriptome analysis of venom gland of Hemiscorpius lepturuswas accomplished in previous work . Metalloproteinase sequences identified in the transcriptome and submitted to NCBI as follows accession numbers: HLMP1; KX924496, HLMP2; KX924497, HLMP3; KX924498 [6,7]. The protein sequences were aligned using Basic Local Alignment Search Tool (BLAST) of National Center for Biotechnology Information (NCBI). The BLASTp tool was used and alignment was performed in Non-redundant protein sequences (nr databank) (http://nlm.nih.gov/BLAST/).
To construct phylogenetic tree, the sequences with high similarity to the metaloprotease sequences of H.lepturus were selected from three taxa: Arachnida (Latrodectus Hesperus ADV40108; Tityus serrulatus CDJ26716.1; Stegodyphus mimosarum KFM63177.1; Parasteatoda tepidariorum XP_015909675.1, XP_015919212.1, XP_021003544.1; Tityus serrulatus CDJ26717.1; Ixodes scapularis XP_002406806.1, XP_002435824.1), Ophidia (Thamnophis sirtalis XP_013907739.1; Protobothrops mucrosquamatus XP_015680512.1; Python bivittatus XP_007429967.1) and Insecta (Pogonomyrmex barbatus XP_011632701.1; Pediculus humanus corporis XP_002426660.1; Zootermopsis nevadensis XP_021917577.1; Stomoxys calcitrans XP_013099168.1; Wasmannia auropunctata XP_011692954.1, XP_011704691.1; Halyomorpha halys XP_014273620.1; Aedes albopictus XP_019532310.1; Camponotus floridanus XP_011253904.1; Helicoverpa armigera XP_021196322.1; Rhagoletis zephyria XP_017463716.1). The polygenetic tree was constructed by Molecular Evolutionary Genetics Analysis software (MEGA 5) using neighbor-joining method and 1000 bootstrap replicate [16,17].
Alignment of HLMP1 in nr databank of NCBI showed 50, 51, 53 and 56 percent identity with astacin-like metalloprotease, [Latrodectus hesperus ADV40108.1], astacin-like metallopeptidase 1 protein [Tityus serrulatus CDJ26716.1], Zinc metalloproteinase nas-4, partial [Stegodyphus mimosarum KFM63177.1], astacin-like metalloprotease toxin5 [Parasteatoda tepidariorum XP_015909675.1, XP_015909677.1], respectively. Alignment results of HLMP2 showed 35, 36 and 45 percent identity to metalloprotease 1 [Ixodes persulcatus AIE44747.1], metalloprotease [Ixodes scapularis XP_002435641.1], metalloserrulase 19 [Tityus serrulatus AMO02561.1], respectively. Alignment analysis of HLMP3 showed 50, 51, 53 and 56 percent identity to astacin-like metalloprotease [Latrodectus hesperus ADV40108.1], astacin-like metallopeptidase 1 protein [Tityus serrulatus CDJ26716.1], Zinc metalloproteinase nas-4 [Stegodyphus mimosarum KFM63177.1], astacin-like metalloprotease toxin 5 [Parasteatoda tepidariorum XP_015909675.1, XP_015909677.1], respectively.
Phylogenetic tree was constructed using 23 sequences of three different taxa: Insecta (11 sequences), Ophidia (3 sequences) and Arachnida (9 sequences).There were different species in Arachnida taxa: scorpions (2 sequences), spiders (5 sequences) and tick (2 sequences). As it can be seen in figure 1 HLMP1 and HLMP3 organized a single calde close to Parasteatoda tepidariorum (XP_021003544.1) and HLMP2 was in other clade. The results indicate that metalloprotease sequences of H.lepturus scorpion are similar to P.tepidariorum spider.
Metalloproteinases exist in the venom of different venomous animal like snake and scorpion [8,15,18]. Hemorrhagic activity of venom is related to the presence of enzymes like metalloproteinase in the venom . The metalloproteinases fall into different groups depending on their metal atom . Three sequences in the transcriptome of H.lepturus are identified that showed similarity to metalloproteinase sequences. HLMP1 and HLMP3 showed similarity with Astacin-like metalloprotease toxin but HLMP2 showed similarity with venom metalloproteinase antarease. Antarease-like Zinc-metalloproteases in the venom of scorpion Tityus serrulatus leads to acute panceratitis . Targeting of metalloprotease in the scorpion venom is novel anti-venom strategy . In phylogenetic analysis of three metalloproteinases from transcriptome of venom gland of H.lrpturus, two clade was organized. The HLMP1 and HLMP3 were in one clade and HLMP2 was in independent clade. The results indicating difference of theses sequences with each other. The analysis was performed on the sequences that achieved by transcriptome analysis of venom gland. It has been reported that some sequences in the transcriptome may not detect in the proteome and some sequences in the proteome may not predict in the transcriptome . Therefore, it seems necessary to compare transcriptome and proteome of H.lepturus venom at same time to analyze the accuracy of achieved sequences.
Here, for the first time phylogenetic analysis of three metalloproteinase sequences from transcriptome of venom gland of H.lepturus was performed. Results showed that two metalloproteinases (HLMP1 and HLMP3) of H.lepturus are most close to spider P.tepidariorum. However, the sequence of HLMP2 was differ from HLMP1 and HLMP3 and formed an independent clade in phylogenetic tree. However further studies on proteome of H.lepturus is needed.
This study was supported by Pasteur Institute of Iran, Tehran, Iran. The authors warmly thanks from Pasteur Institute of Iran, Tehran, Iran for supporting current study.
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