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The Diversity of Bioactive Proteins in Australian Snake Venoms* S

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The Diversity of Bioactive Proteins in Australian Snake Venoms* S Research The Diversity of Bioactive Proteins in Australian Snake Venoms*□S Geoff W. Birrell‡§¶, Stephen T. H. Earl‡§¶, Tristan P. Wallis‡ʈ**, Paul P. Masci‡‡, John de Jersey§§, Jeffrey J. Gorman‡ʈ**, and Martin F. Lavin‡§¶¶ Australian elapid snakes are among the most venomous bas (1). The venoms are complex mixtures of proteins and in the world. Their venoms contain multiple components peptides possessing a variety of biological activities, and that target blood hemostasis, neuromuscular signaling, because the amount of venom injected into an animal that and the cardiovascular system. We describe here a com- reaches the bloodstream may be minute, venom components prehensive approach to separation and identification of must achieve their effects at very low concentrations. The use the venom proteins from 18 of these snake species, rep- of snake venom in different pathophysiological conditions has resenting nine genera. The venom protein components been mentioned in homeopathy and folk medicine for centu- were separated by two-dimensional PAGE and identified Downloaded from using mass spectrometry and de novo peptide sequencing. ries. Recently there have been a number of examples of snake The venoms are complex mixtures showing up to 200 pro- venoms used in the development of novel human therapeu- tein spots varying in size from <7 to over 150 kDa and in pI tics. These include the antihypertensive drug captopril (2), from 3 to >10. These include many proteins identified pre- modeled from the venom of the Brazilian arrowhead viper viously in Australian snake venoms, homologs identified in (Bothrops jaracusa); the anticoagulant Integrilin (eptifibatide https://www.mcponline.org other snake species, and some novel proteins. In many (3)), a heptapeptide derived from a protein found in the venom cases multiple trains of spots were typically observed in the of the American southeastern pygmy rattlesnake (Sistrurus higher molecular mass range (>20 kDa) (indicative of post- miliarius barbouri); Ancrod (4), a compound isolated from the translational modification). Venom proteins and their post- translational modifications were characterized using spe- venom of the Malaysian pit viper (Agkistrodon rhodostoma) for cific antibodies, phosphoprotein- and glycoprotein-specific use in the treatment of heparin-induced thrombocytopenia stains, enzymatic digestion, lectin binding, and antivenom and stroke; and alfimeprase, a novel fibrinolytic metallopro- reactivity. In the lower molecular weight range, several pro- teinase for thrombolysis derived from southern copperhead teins were identified, but the predominant species were snake (Agkistrodon contortrix contortrix) venom (5). Two at UQ Library on April 27, 2020 ␣ phospholipase A2 and -neurotoxins, both represented by venom proteins from the Australian brown snake, Pseudonaja different sequence variants. The higher molecular weight textilis, are currently in development as human therapeutics range contained proteases, nucleotidases, oxidases, and (QRxPharma). The first is a single agent procoagulant that is a homologs of mammalian coagulation factors. This informa- homolog of mammalian Factor Xa prothrombin activator (6), tion together with the identification of several novel proteins whereas the other is a plasmin inhibitor, named Textilinin-1, (metalloproteinases, vespryns, phospholipase A2 inhibitors, .(protein-disulfide isomerase, 5؅-nucleotidases, cysteine- with antihemorrhagic properties (7 rich secreted proteins, C-type lectins, and acetylcholines- Although there is much known about the protein composi- terases) aids in understanding the lethal mechanisms of tions of venoms from Asian and American snakes, compara- elapid snake venoms and represents a valuable resource tively little is known of Australian snakes. This is despite the for future development of novel human therapeutics. top 10 most toxic snakes (determined by LD50 (lethal dose in Molecular & Cellular Proteomics 6:973–986, 2007. mice to kill 50%)) being Australian elapid snakes (8). Austra- lian snakes are most closely related to Asian snakes, and although they have significantly higher toxicity, they cause far The venomous land snakes of Australia belong to the Elap- fewer deaths by envenomation than their Asian counterparts, idae family that also includes the Afro-Asian cobras, the most likely due to lower population density and more wide- American coral snakes, the Asian kraits, and the African mam- spread availability of suitable health care in Australia (8). Pro- teins and peptides comprise the majority of the dry weight of From ‡The Queensland Institute of Medical Research, P. O. Royal Brisbane Hospital, Brisbane 4029, Australia and the §Central Clinical elapid snake venoms, whereas other components include Division and ‡‡Southern Clinical Division, Faculty of Health Sciences, metallic cations, carbohydrates, nucleosides, biogenic ʈInstitute for Molecular Biosciences, and §§School of Molecular and amines, and low levels of free amino acids and lipids (9, 10). Microbial Sciences, University of Queensland, Brisbane 4072, Venoms from Australian elapids can be loosely divided into Australia procoagulant and anticoagulant types. The procoagulant ven- Received, November 1, 2006, and in revised form, February 1, 2007 Published, MCP Papers in Press, February 21, 2007, DOI 10.1074/ oms contain serine proteases (prothrombin activators) that mcp.M600419-MCP200 cleave prothrombin to produce thrombin in the coagulation © 2007 by The American Society for Biochemistry and Molecular Biology, Inc. Molecular & Cellular Proteomics 6.6 973 This paper is available on line at http://www.mcponline.org Diversity in Australian Snake Venoms cascade resulting in coagulation. Snake venom prothrombin include L-amino-acid oxidase, nerve growth factor (NGF), and activators are classified into four groups based on functional natriuretic peptides. L-Amino-acid oxidase was identified in P. characteristics, structural properties, and cofactor require- australis venom and in purified form was found to be antibac- ments (11). Group A and B prothrombin activators are metal- terial when tested against the important pathogen Aeromonas loproteinases, whereas Group C and D prothrombin activa- hydrophila (22). This protein has also been identified in Viper- tors are serine proteinases. Some Australian snake venoms idae snake venoms. NGF has been identified in multiple Asian are known to contain Group C or Group D prothrombin acti- and African snake venoms but has been reported only re- vators (12). Group C prothrombin activators resemble the cently as a component of Australian elapid venoms (23). NGF mammalian Factor Xa (FXa)1-Factor Va (FVa) complex, from Oxyuranus scutellatus venom is glycosylated and shows whereas Group D activators are structurally and functionally the ability to induce neurite outgrowth of PC12 cells, a stand- similar to FXa alone (12, 13). The Group C prothrombin acti- ard assay for NGF activity (23). Natriuretic peptides from vator from the Australian brown snake, P. textilis, has been Oxyuranus microlepidotus venom show potent arterial extensively studied and named Pseutarin C (14). The 1461- smooth muscle relaxant effects (24). Natriuretic peptides have amino acid FVa-like non-enzymatic subunit of Pseutarin C has been identified and characterized from several Australian been shown to share 50% sequence identity and significant elapid venoms and represent the smallest known proteins structural homology with human FVa (15). Another hemosta- from these venoms at only 35–39 amino acids (25). sis-related family of proteins identified in Australian snake The present study describes a thorough screening and Downloaded from venom is the textilinin family of plasmin inhibitors (16). These identification of the venom proteins present in 18 Australian 7-kDa proteins share ϳ45% identity with aprotinin, a bovine elapid snake species representing nine genera of the most Kunitz-type serine protease inhibitor that acts on plasmin and venomous snakes on earth. In addition, post-translational kallikrein to reduce blood loss during surgery. Six isoforms of modifications such as glycosylation, phosphorylation, and textilinin have been identified in P. textilis venom gland-de- ␥-carboxylation were examined in the venom proteins using https://www.mcponline.org rived cDNA (7). specific stains and antibodies. Glycoforms of multiple pro- Australian snake venoms are also known to contain PLA2s teins were identified and characterized using lectin binding and peptidic neurotoxins (for a review, see Ref. 17). Australian specificity. Also antivenom reactivity of venom proteins was elapid PLA2s have seven conserved disulfide bonds and mo- examined using tiger snake (Notechis) antivenom raised in lecular masses of 13–15 kDa. As well as phospholipase ac- horses for clinical use in envenomated people. Many proteins tivity, individual PLA2s are known to have myotoxic, neuro- previously unknown in Australian snake venoms were identi- ␣ toxic, and/or anticoagulant activities. The -neurotoxins fied based on sequence matches to venom proteins from at UQ Library on April 27, 2020 found in Australian elapids are postsynaptic blocking short or other snakes. This information sheds light on evolutionary long chain neurotoxins (18, 19). Short and long chain neuro- relationships between the different snake species and the toxins have similar effects and bind with high affinity to skel- clinical manifestations of envenomation. This comprehensive etal nicotinic acetylcholine
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