Dodecamer is required for agglutination of Litopenaeus vannamei hemocyanin with bacterial cells and red blood cells.
Mar Biotechnol (NY)
; 10(6): 645-52, 2008.
Article
en En
| MEDLINE
| ID: mdl-18521667
ABSTRACT
Hemocyanins are multi-functional proteins, although they are well known to be respiratory proteins of invertebrate to date. In the present study, the agglutination ability of two oligomers of hemocyanin, hexamer and dodecamer, with pathogenic bacteria and red blood cells (RBCs) is investigated in pacific white shrimp, Litopenaeus vannamei. Hexameric hemocyanin exhibits an extremely high stability even in the absence of Ca(2+) and in alkaline pH. Dodecamer (di-hexamer) is easily dissociated into hexamers in unphysiological conditions. Hexamer and dodecamer are interchanged reciprocally with environmental conditions. Both oligomers can bind to bacteria and RBCs, but agglutination is observed only using dodecamer but not using hexamer in agglutination assay. However, the agglutination is detected when hexamer is utilized in the presence of antiserum against hemocyanin. These results indicate that dodecamer of hemocyanin is required for agglutination with bacteria and RBCs. It can be logically inferred that there is only one carbohydrate-binding site to bacterial cells and RBCs in the hexamer, while at least two sites in the dodecamer. Our finding has provided new insights into structural-functional relationship of hemocyanin.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Bacterias
/
Hemocianinas
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Penaeidae
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Eritrocitos
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Hemaglutinación
Límite:
Animals
Idioma:
En
Revista:
Mar Biotechnol (NY)
Asunto de la revista:
BIOLOGIA
/
BIOTECNOLOGIA
Año:
2008
Tipo del documento:
Article
Pais de publicación:
EEUU
/
ESTADOS UNIDOS
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ESTADOS UNIDOS DA AMERICA
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EUA
/
UNITED STATES
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UNITED STATES OF AMERICA
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US
/
USA