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• W2048837611 abstract "We have used immunocytochemistry and molecular cloning methods to identify and characterize structural polypeptides of the centromere. These studies permit us to resolve two distinct regions: the inner and outer centromere, (i) Components of the outer centromere: autoantibodies from certain patients with rheumatic disease identify a family of three immunologically related polypeptides that we have designated CENP-A (17 kDa), CENP-B (80 kDa), and CENP-C (140 kDa). CENP-B has been cloned and sequenced. DNA sequence analysis indicates that this polypeptide possesses two large regions with extraordinary concentrations of acidic residues (region I: 61 residues with 79% glu + asp; region II: 31 residues with 87% glu + asp). Despite this concentration of negative charge, immunocytochemical experiments suggest that CENP-B may be a DNA binding protein. In these experiments, the levels of CENP-B are seen to vary reproducibly from chromosome to chromosome. The role of CENP-B in vivo is unknown. However, it is unlikely to bind directly to the spindle microtubules since it is found at an inactive centromere that apparently does not attach to the spindle. (ii) Components of the inner centromere: we have injected mice with the whole chromosome scaffold fraction to elicit production of monoclonal antibodies. One such antibody identifies two structurally related polypeptides (the INCENP antigens, 135 and 155 kDa) that are preferentially located between the sister chromatids at the centromere. The INCENP antigens undergo dramatic movements from the chromosomes to the central spindle during mitosis. They are ultimately sequestered in the midbody and discarded. Several lines of evidence suggest that the INCENP polypeptides may be involved in the regulation of sister chromatid separation at the metaphase–anaphase transition.Key words: mitosis, centromere, CENP antigens, INCENP antigens, kinetochore, disjunction." @default.
• W2048837611 created "2016-06-24" @default.
• W2048837611 creator A5004997586 @default.
• W2048837611 creator A5047873642 @default.
• W2048837611 date "1989-01-15" @default.
• W2048837611 modified "2023-09-25" @default.
• W2048837611 title "Proteins of the inner and outer centromere of mitotic chromosomes" @default.
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• W2048837611 doi "https://doi.org/10.1139/g89-103" @default.
• W2048837611 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/2698830" @default.
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