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To investigate polyP localization, we developed a novel technique using the affinity of the recombinant polyphosphate binding domain (PPBD) of Escherichia coli exopolyphosphatase to polyP. An epitope-tagged PPBD was expressed and purified from E. coli. Equilibrium binding assay of PPBD revealed its high affinity for long-chain polyP and its weak affinity for short-chain polyP and nucleic acids. To directly demonstrate polyP localization in Saccharomyces cerevisiae on resin sections prepared by rapid freezing and freeze- substitution, specimens were labeled with PPBD containing an epitope tag and then the epitope tag was detected by an indirect immunocytochemical method. A goat anti-mouse immunoglobulin G antibody conjugated with Alexa 488 for laser confocal microscopy or with colloidal gold for transmission electron microscopy was used. When the S. cerevisiae was cultured in yeast extract-peptone-dextrose medium (10 mM phosphate) for 10 h, polyP was distributed in a dispersed fashion in vacuoles in successfully cryofixed cells. A few polyP signals of the labeling were sometimes observed in cytosol around vacuoles with electron microscopy. Under our experimental conditions, polyP granules were not observed. Therefore, it remains unclear whether the method can detect the granule form. The method directly demonstrated the localization of polyP at the electron microscopic level for the first time and enabled the visualization of polyP localization with much higher specificity and resolution than with other conventional methods."}]}, "item_creator": {"attribute_name": "\u8457\u8005", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Saito,  K"}], "nameIdentifiers": [{"nameIdentifier": "33033", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ohtomo,  R"}], "nameIdentifiers": [{"nameIdentifier": "33034", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Kuga-Uetake,  Y"}], "nameIdentifiers": [{"nameIdentifier": "33035", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Aono,  T"}], "nameIdentifiers": [{"nameIdentifier": "33036", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Saito,  M"}], "nameIdentifiers": [{"nameIdentifier": "33037", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "\u30d5\u30a1\u30a4\u30eb\u60c5\u5831", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2015-09-25"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "Direct labeling of polyphosphate.pdf", "filesize": [{"value": "707.0 kB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 707000.0, "url": {"label": "Direct labeling of polyphosphate.pdf", "url": "https://soar-ir.repo.nii.ac.jp/record/10437/files/Direct labeling of polyphosphate.pdf"}, "version_id": "604939dd-8c91-4cac-bf61-bbec3a604f08"}]}, "item_language": {"attribute_name": "\u8a00\u8a9e", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"resourcetype": "journal article", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Direct labeling of polyphosphate at the ultrastructural level in Saccharomyces cerevisiae by using the affinity of the polyphosphate binding domain of Escherichia coli exopolyphosphatase", "item_titles": {"attribute_name": "\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_title": "Direct labeling of polyphosphate at the ultrastructural level in Saccharomyces cerevisiae by using the affinity of the polyphosphate binding domain of Escherichia coli exopolyphosphatase"}]}, "item_type_id": "6", "owner": "1", "path": ["1016/1017"], "permalink_uri": "http://hdl.handle.net/10091/197", "pubdate": {"attribute_name": "\u516c\u958b\u65e5", "attribute_name_i18n": "\u516c\u958b\u65e5", "attribute_value": "2007-05-07"}, "publish_date": "2007-05-07", "publish_status": "0", "recid": "10437", "relation": {}, "relation_version_is_last": true, "title": ["Direct labeling of polyphosphate at the ultrastructural level in Saccharomyces cerevisiae by using the affinity of the polyphosphate binding domain of Escherichia coli exopolyphosphatase"], "weko_shared_id": null}