カンノ　ヒトシ   KAN'NO Hitoshi   菅野　仁    所属   医学部 医学科    職種   特任教授
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Molecular basis of impaired pyruvate kinase isozyme conversion in erythroid cells: a single amino acid substitution near the active site and decreased mRNA content of the R-type PK.
掲載誌名	正式名：Biochemical and biophysical research communications 略　 称：Biochem Biophys Res Commun ISSNコード：0006-291X(Print)0006-291X(Linking)
巻・号・頁	192(1),pp.46-52
著者・共著者	Kanno H, Fujii H, Tsujino G, Miwa S
発行年月	1993/04
概要	Conversion of pyruvate kinase (PK) isozymes from M2- to R-PK has been observed during erythroid cell maturation. To understand this mechanism, we analyzed the PK gene of a R-PK deficient patient, in whose erythrocytes the M2-PK was persistently expressed. A point mutation, 1102 GTC-->TTC was identified in the R-PK cDNA, and it caused a single amino acid substitution from 368Val-->Phe. The residue is very close to the 372nd Gln, the putative binding site of the monovalent cation (K+). The impaired K+ binding would cause the decreased affinity for phosphoenolpyruvate, consequently the variant PK may be extremely unstable. Although the proband's other PK allele did not have any structural change, the R-PK mRNA level in reticulocytes was decreased. These findings suggested that both the structural mutation near the active site and the decreased mRNA level of the R-PK were responsible for the disorder.
DOI	10.1006/bbrc.1993.1379
文献番号	8476433