Purification of an L-amino acid oxidase from Bungarus caeruleus (Indian krait) venom
Snake venoms are rich in enzymes such as phospholipase A2, proteolytic enzymes, hyaluronidases and phosphodiesterases, which are well characterized. However, L-amino acid oxidase (LAO EC.1.4.3.2) from snake venoms has not been extensively studied. A novel L-amino acid oxidase from Bungarus caeruleus...
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ftdoajarticles:oai:doaj.org/article:c0ce68dd7ccc40928f100a19dfc48a6d 2023-05-15T15:10:24+02:00 Purification of an L-amino acid oxidase from Bungarus caeruleus (Indian krait) venom SS More KM Kiran SM Veena JR Gadag 2010-01-01T00:00:00Z https://doaj.org/article/c0ce68dd7ccc40928f100a19dfc48a6d EN eng SciELO http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992010000100007 https://doaj.org/toc/1678-9199 1678-9199 https://doaj.org/article/c0ce68dd7ccc40928f100a19dfc48a6d Journal of Venomous Animals and Toxins including Tropical Diseases, Vol 16, Iss 1, Pp 60-76 (2010) L-amino acid oxidase Bungarus caeruleus platelet aggregation Arctic medicine. Tropical medicine RC955-962 Toxicology. Poisons RA1190-1270 Zoology QL1-991 article 2010 ftdoajarticles 2022-12-31T01:59:55Z Snake venoms are rich in enzymes such as phospholipase A2, proteolytic enzymes, hyaluronidases and phosphodiesterases, which are well characterized. However, L-amino acid oxidase (LAO EC.1.4.3.2) from snake venoms has not been extensively studied. A novel L-amino acid oxidase from Bungarus caeruleus venom was purified to homogeneity using a combination of ion-exchange by DEAE-cellulose chromatography and gel filtration on Sephadex® G-100 column. The purified monomer of LAO showed a molecular mass of 55 ±1 kDa estimated by SDS-PAGE. The specific activity of purified LAO was 6,230 ± 178 U/min/mg, versus 230 ± 3.0 U/min/mg for the whole desiccated venom, suggesting a 27-fold purification with a 25% yield. Optimal pH and temperature for maximum purified enzyme activity were 6.5 and 37ºC, respectively. Platelet aggregation studies show that purified LAO inhibited ADP-induced platelet aggregation dose-dependently at 0.01 to 0.1 µM with 50% inhibitory concentration (IC50) of 0.04 µM, whereas at a 0.08 µM concentration it did not induce appreciable aggregation on normal platelet-rich plasma (PRP). The purified protein catalyzed oxidative deamination of L-amino acids while the most specific substrate was L-leucine. The purified LAO oxidizes only L-forms, but not D-forms of amino acids, to produce H2O2. The enzyme is important for the purification and determination of certain amino acids and for the preparation of α-keto acids. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Indian |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
L-amino acid oxidase Bungarus caeruleus platelet aggregation Arctic medicine. Tropical medicine RC955-962 Toxicology. Poisons RA1190-1270 Zoology QL1-991 |
spellingShingle |
L-amino acid oxidase Bungarus caeruleus platelet aggregation Arctic medicine. Tropical medicine RC955-962 Toxicology. Poisons RA1190-1270 Zoology QL1-991 SS More KM Kiran SM Veena JR Gadag Purification of an L-amino acid oxidase from Bungarus caeruleus (Indian krait) venom |
topic_facet |
L-amino acid oxidase Bungarus caeruleus platelet aggregation Arctic medicine. Tropical medicine RC955-962 Toxicology. Poisons RA1190-1270 Zoology QL1-991 |
description |
Snake venoms are rich in enzymes such as phospholipase A2, proteolytic enzymes, hyaluronidases and phosphodiesterases, which are well characterized. However, L-amino acid oxidase (LAO EC.1.4.3.2) from snake venoms has not been extensively studied. A novel L-amino acid oxidase from Bungarus caeruleus venom was purified to homogeneity using a combination of ion-exchange by DEAE-cellulose chromatography and gel filtration on Sephadex® G-100 column. The purified monomer of LAO showed a molecular mass of 55 ±1 kDa estimated by SDS-PAGE. The specific activity of purified LAO was 6,230 ± 178 U/min/mg, versus 230 ± 3.0 U/min/mg for the whole desiccated venom, suggesting a 27-fold purification with a 25% yield. Optimal pH and temperature for maximum purified enzyme activity were 6.5 and 37ºC, respectively. Platelet aggregation studies show that purified LAO inhibited ADP-induced platelet aggregation dose-dependently at 0.01 to 0.1 µM with 50% inhibitory concentration (IC50) of 0.04 µM, whereas at a 0.08 µM concentration it did not induce appreciable aggregation on normal platelet-rich plasma (PRP). The purified protein catalyzed oxidative deamination of L-amino acids while the most specific substrate was L-leucine. The purified LAO oxidizes only L-forms, but not D-forms of amino acids, to produce H2O2. The enzyme is important for the purification and determination of certain amino acids and for the preparation of α-keto acids. |
format |
Article in Journal/Newspaper |
author |
SS More KM Kiran SM Veena JR Gadag |
author_facet |
SS More KM Kiran SM Veena JR Gadag |
author_sort |
SS More |
title |
Purification of an L-amino acid oxidase from Bungarus caeruleus (Indian krait) venom |
title_short |
Purification of an L-amino acid oxidase from Bungarus caeruleus (Indian krait) venom |
title_full |
Purification of an L-amino acid oxidase from Bungarus caeruleus (Indian krait) venom |
title_fullStr |
Purification of an L-amino acid oxidase from Bungarus caeruleus (Indian krait) venom |
title_full_unstemmed |
Purification of an L-amino acid oxidase from Bungarus caeruleus (Indian krait) venom |
title_sort |
purification of an l-amino acid oxidase from bungarus caeruleus (indian krait) venom |
publisher |
SciELO |
publishDate |
2010 |
url |
https://doaj.org/article/c0ce68dd7ccc40928f100a19dfc48a6d |
geographic |
Arctic Indian |
geographic_facet |
Arctic Indian |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Journal of Venomous Animals and Toxins including Tropical Diseases, Vol 16, Iss 1, Pp 60-76 (2010) |
op_relation |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992010000100007 https://doaj.org/toc/1678-9199 1678-9199 https://doaj.org/article/c0ce68dd7ccc40928f100a19dfc48a6d |
_version_ |
1766341447289667584 |