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Doctoral Thesis
DOI
10.11606/T.60.2012.tde-04092012-161625
Document
Author
Full name
Karla de Castro Figueiredo Bordon
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2012
Supervisor
Committee
Braga, Eliane Candiani Arantes (President)
Araújo, Heloisa Sobreiro Selistre de
Cabral, Hamilton
Marcussi, Silvana
Rosa, Jose Cesar
Title in Portuguese
Caracterização funcional e estrutural da hialuronidase isolada da peçonha de serpente Crotalus durissus terrificus
Keywords in Portuguese
atividade antiedematogênica
cristalografia de proteína
Crotalus durissus terrificus
estudos cinéticos
fosfolipase A2
hialuronidase
peçonha
Abstract in Portuguese
Hialuronidases são responsáveis pela hidrólise de hialuronan, o principal componente da matriz intersticial. Estas enzimas são ubíquas nas peçonhas de serpentes, contudo suas concentrações e características podem variar entre as espécies. Embora estudos indiquem a presença de atividade hialuronidásica na peçonha de Crotalus durissus terrificus e a hialuronidase apresente importante papel no envenenamento local e sistêmico, a enzima ainda não havia sido estudada. Os objetivos deste trabalho focaram o isolamento e a caracterização funcional e estrutural da hialuronidase (CdtHya1) presente na peçonha de serpente Crotalus durissus terrificus. CdtHya1 foi purificada por cromatografia de troca iônica seguida de filtração molecular e interação hidrofóbica (recuperação proteica = 0,23%), consistindo no primeiro estudo de isolamento e caracterização de uma hialuronidase crotálica. Os 44 primeiros aminoácidos do seu N-terminal foram determinados por degradação de Edman e mostraram compartilhar um elevado grau de identidade sequencial com outras hialuronidases depositadas em bancos de dados. CdtHya1 é uma glicoproteína e apresentou atividade máxima a 37°C, pH 5,5 e na presença de NaCl 0,2 mol/L. Seu monômero de 64,5 kDa foi estimado por SDS-PAGE sob condições redutoras. A atividade específica da peçonha solúvel foi 145 unidades turbidimétricas reduzidas por miligrama (UTR/mg), contra 5.066 UTR/mg para CdtHya1. A enzima apresentou Kcat de 3.781,0 min-1 sobre hialuronan e em torno de 400 min-1 sobre os sulfatos de condroitina A, B e C, indicando maior atividade sobre hialuronan. Cátions divalentes (Ca2+ e Mg2+) e NaCl 1 mol/L reduzem significativamente a atividade enzimática. A enzima pura (32 UTR/40 ?L) diminuiu o edema provocado pela injeção subplantar de tampão, crotoxina ou fosfolipase A2 (PLA2), aumentando a difusão destes pelos tecidos dos camundongos. CdtHya1 potencializou a ação da crotoxina, como evidenciado pela morte de camundongos até o final do ensaio de edema de pata. A enzima nativa pura foi submetida a ensaios cristalográficos preliminares onde foram obtidos os primeiros cristais, constituindo assim um passo importante para a determinação da primeira estrutura tridimensional de hialuronidase de peçonha de serpente. Este estudo relata o procedimento de purificação da CdtHya1, a primeira hialuronidase isolada de peçonhas crotálicas com alta atividade antiedematogênica.
Title in English
Functional and structural characterization of hyaluronidase isolated from Crotalus durissus terrificus snake venom
Keywords in English
antiedematogenic activity
Crotalus durissus terrificus
hyaluronidase
kinetic studies
phospholipase A2
protein crystallography
venom
Abstract in English
Hyaluronidases are responsible for hyaluronan hydrolysis, the major component of the interstitial matrix. These enzymes are ubiquitous in snake venoms, however their concentrations and characteristics may vary between species. Although studies indicate the presence of hyaluronidase activity in the Crotalus durissus terrificus venom and hyaluronidase presents important role in local and systemic envenoming, the enzyme has not been studied yet. The objectives of this study focused on the isolation and functional and structural characterization of hyaluronidase (CdtHya1) presents in Crotalus durissus terrificus snake venom. CdtHya1 was purified by ion exchange chromatography followed by molecular filtration and hydrophobic interaction (protein recovery = 0.23%), consisting in the first study on the isolation and characterization of a crotalic hyaluronidase. Its first 44 N-terminal amino acids were determined by Edman degradation and showed to share a high level of sequence identity against other hyaluronidases deposited in data banks. CdtHya1 is a glycoprotein and it showed maximum activity at 37 °C, pH 5.5 and in the presence of 0.2 mol/L NaCl. Its monomer of 64.5 kDa was estimated by SDS-PAGE under reducing conditions. The soluble venom specific activity was 145 turbidity reducing units per milligram (TRU/mg), against 5,066 TRU/mg for CdtHya1. The enzyme showed Kcat of 3,781.0 min-1 on hyaluronan and about 400 min-1 on chondroitin sulphates A, B or C, indicating higher activity on hyaluronan. Divalent cations (Ca2+ and Mg2+) and 1 mol/L NaCl significantly reduce the enzyme activity.The pure enzyme (32 TRU/40 ?L) decreased the edema caused by subplantar injections of buffer, crotoxin or phospholipase A2 (PLA2), increasing their diffusion through mice tissues. CdtHya1 potentiated crotoxin action, as evidenced by mice death by the end of the paw edema assay. The pure native enzyme was subjected to preliminary crystallographic studies where the first crystals were obtained, thus providing an important step in determining the first three-dimensional structure of hyaluronidase snake venom. This study reports the purification procedure of CdtHya1, the first hyaluronidase isolated from crotalic venoms with high antiedematogenic activity.
 
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Publishing Date
2012-10-08
 
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