期刊
BIOCHIMIE
卷 206, 期 -, 页码 36-48出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.biochi.2022.09.019
关键词
Metapenaeus monoceros; Hemocyanin; Hemagglutination; Docking
In this study, a hemocyanin (MmHc) was purified from a shrimp species and found to have hemagglutination activity that was specifically inhibited by Lewis B and Lewis Y tetrasaccharides. The MmHc is an oligomeric protein with oxygen carrier function and interacts with the Lewis Y antigen.
Lectins or agglutinins are mainly proteins or glycoproteins, reported to uphold an ability to agglutinate the red blood cells (RBCs) with a known sugar specificity in a diverse group of organisms. In the present study, we purified a hemocyanin (named as MmHc) from a shrimp, Metapenaeus monoceros by sizeexclusion chromatography. Further characterization revealed that the purified MmHc showed hemagglutination activity that was found to be specifically inhibited by Lewis B and Lewis Y tetrasaccharides. The MmHc displayed two oligomers of molecular weight approximately -78 and -85 kDa in SDS-PAGE. The native molecular mass of MmHc was found to be -457 kDa as determined by size-exclusion chromatography which indicated that the purified MmHc is an oligomeric protein. MmHc showed a maximum activity within pH 7.0-8.0, while a wide range of temperature stability was observed between 4 to 55 degrees C, however, it did not show any dependency on metal ions for binding. Subsequently, the analysis of the peptides by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry (MS) identified the purified MmHc as shrimp hemocyanin showing significant similarity to the hemocyanin of Penaeus vannamei. The results of multiple sequence alignment and detailed analysis of the molecular interactions predicted by AutoDock suggested that besides the oxygen carrier function, this MmHc may have multiple roles and can interact well with the Lewis Y antigen through a typical sugar binding motif containing the similar hydrophilic amino acids as the conserved residues.(c) 2022 Elsevier B.V. and Societe Francaise de Biochimie et Biologie Moleculaire (SFBBM). All rights reserved.
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