| |
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Amazônia Oriental. |
|
Data corrente: |
27/12/2011 |
|
Data da última atualização: |
11/11/2022 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
SILVA, T. A. S. e; KNOB, A.; TREMACOLDI, C. R.; BROCHETTO-BRAGA, M. R.; CARMONA, E. C. |
|
Afiliação: |
TALITA A. SAMPAIO E SILVA, UFSCAR; ADRIANA KNOB, UNICENTRO; CELIA REGINA TREMACOLDI, CPATU; MARCIA R. BROCHETTO-BRAGA, UNESP; ELEONORA CANO CARMONA, UNESP. |
|
Título: |
Purification and some properties of an extracellular acid protease from Aspergillus clavatus. |
|
Ano de publicação: |
2011 |
|
Fonte/Imprenta: |
World Journal of Microbiology and Biotechnology, v. 27, n. 11, p. 2491-2497, Nov. 2011. |
|
DOI: |
10.1007/s11274-011-0717-3 |
|
Idioma: |
Inglês |
|
Conteúdo: |
Acid proteases represent an important group of enzymes, widely used in food, beverage and pharmaceutical industries. For most of these applications the enzymatic preparation must be at least partially purified and free of substances that could change the characteristics of the product or the process. Fungal proteases have replaced other sources because they are easily obtained mainly from Mucor, Rhizopus, Penicillium and Aspergillus species. A strain of Aspergillus clavatus was selected by producing high level of acid protease activity. An extracellular aspartatic protease from this strain was purified 37.2 times with 37% recovery using (NH4)2SO4 fractionation and ion-exchange chromatography. The enzyme was found to be monomeric having a molecular mass of 30.4 kDa. The purified enzyme is an acid protease with optimum pH of 5.5 and temperature for optimum activity of 50 °C. Its high pH stability was verified in the range of 3.5?6.5. The acid protease was strongly inhibited by Hg+2 and partially inhibited by Cu+2, Zn+2 and Mn+2. The enzyme was sensitive to denaturing agent SDS and activated by thiol-containing reducing agent dithiotreitol (DTT). The protease activity was not influenced by iodoacetic acid, E-64 and PMSF, while it was lightly actived by EDTA and totally inhibited by pepstatin, with a Ki of 7.8 μM, indicating that is an aspartic protease. A. clavatus acid protease presents interesting characteristics for biotechnological process, such as cheese and flavor manufacture and dietary supplements, in which activity and stability in acid pH are required. MenosAcid proteases represent an important group of enzymes, widely used in food, beverage and pharmaceutical industries. For most of these applications the enzymatic preparation must be at least partially purified and free of substances that could change the characteristics of the product or the process. Fungal proteases have replaced other sources because they are easily obtained mainly from Mucor, Rhizopus, Penicillium and Aspergillus species. A strain of Aspergillus clavatus was selected by producing high level of acid protease activity. An extracellular aspartatic protease from this strain was purified 37.2 times with 37% recovery using (NH4)2SO4 fractionation and ion-exchange chromatography. The enzyme was found to be monomeric having a molecular mass of 30.4 kDa. The purified enzyme is an acid protease with optimum pH of 5.5 and temperature for optimum activity of 50 °C. Its high pH stability was verified in the range of 3.5?6.5. The acid protease was strongly inhibited by Hg+2 and partially inhibited by Cu+2, Zn+2 and Mn+2. The enzyme was sensitive to denaturing agent SDS and activated by thiol-containing reducing agent dithiotreitol (DTT). The protease activity was not influenced by iodoacetic acid, E-64 and PMSF, while it was lightly actived by EDTA and totally inhibited by pepstatin, with a Ki of 7.8 μM, indicating that is an aspartic protease. A. clavatus acid protease presents interesting characteristics for biotechnological process, such as cheese and flavor ma... Mostrar Tudo |
|
Palavras-Chave: |
Acid protease; Propriedades bioquímicas; Purificação de enzimas. |
|
Categoria do assunto: |
W Química e Física |
|
Marc: |
LEADER 02311naa a2200217 a 4500
001 1911047
005 2022-11-11
008 2011 bl uuuu u00u1 u #d
024 7 $a10.1007/s11274-011-0717-3$2DOI
100 1 $aSILVA, T. A. S. e
245 $aPurification and some properties of an extracellular acid protease from Aspergillus clavatus.$h[electronic resource]
260 $c2011
520 $aAcid proteases represent an important group of enzymes, widely used in food, beverage and pharmaceutical industries. For most of these applications the enzymatic preparation must be at least partially purified and free of substances that could change the characteristics of the product or the process. Fungal proteases have replaced other sources because they are easily obtained mainly from Mucor, Rhizopus, Penicillium and Aspergillus species. A strain of Aspergillus clavatus was selected by producing high level of acid protease activity. An extracellular aspartatic protease from this strain was purified 37.2 times with 37% recovery using (NH4)2SO4 fractionation and ion-exchange chromatography. The enzyme was found to be monomeric having a molecular mass of 30.4 kDa. The purified enzyme is an acid protease with optimum pH of 5.5 and temperature for optimum activity of 50 °C. Its high pH stability was verified in the range of 3.5?6.5. The acid protease was strongly inhibited by Hg+2 and partially inhibited by Cu+2, Zn+2 and Mn+2. The enzyme was sensitive to denaturing agent SDS and activated by thiol-containing reducing agent dithiotreitol (DTT). The protease activity was not influenced by iodoacetic acid, E-64 and PMSF, while it was lightly actived by EDTA and totally inhibited by pepstatin, with a Ki of 7.8 μM, indicating that is an aspartic protease. A. clavatus acid protease presents interesting characteristics for biotechnological process, such as cheese and flavor manufacture and dietary supplements, in which activity and stability in acid pH are required.
653 $aAcid protease
653 $aPropriedades bioquímicas
653 $aPurificação de enzimas
700 1 $aKNOB, A.
700 1 $aTREMACOLDI, C. R.
700 1 $aBROCHETTO-BRAGA, M. R.
700 1 $aCARMONA, E. C.
773 $tWorld Journal of Microbiology and Biotechnology$gv. 27, n. 11, p. 2491-2497, Nov. 2011.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Amazônia Oriental (CPATU) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 2 | |
| Registros recuperados : 2 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
