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. 1991 Jan;82(1):51–57. doi: 10.1111/j.1349-7006.1991.tb01745.x

Two Types of DNA Ligase I Activity in Lymphoblastoid Cells from Patients with Bloom's Syndrome

Takayuki Kurihara 1,2,✉, Hirobumi Teraoka 3, Masao Inoue 1, Hiraku Takebe 2, Kouichi Kouichi 2
PMCID: PMC5918217  PMID: 1900268

Abstract

DNA ligases I and II were separated by hydroxylapatite (HA) column chromatography in cell‐free extracts of lymphoblastoid cell lines (LCLs) derived from two unrelated patients with Bloom's syndrome (BS) and two healthy individuals. The specific activity of ligase I from the crude extract was consistently lower in GM3403, a BS LCL from an Ashkenazi Jewish patient, than in normal control LCLs. By contrast, the level of ligase I activity in BSL‐2KA, another BS LCL derived from a Japanese patient, was equivalent to those in normal LCLs, although GM3403 and BSL‐2KA shared the feature of exceedingly high frequency of spontaneous sister‐chromatid exchange. The levels of total ligase activity in crude extracts without the separation into the two forms, however, were approximately two‐fold higher for the two BS LCLs than for the normal LCLs. Partial purification by chromatography on a DEAE‐cellulose 23 column and a phosphocellulose column did not affect the superiority of the two BS LCLs over the normal LCLs in the specific activity of the total ligases. Nonetheless, subsequent application to an HA column again resulted in much less elevation of the specific activity of ligase I for GM3403 than for BSL‐2KA and control LCLs. The levels of ligase II activity, accounting for 4‐13% of total ligase activity, were similar among the LCLs examined. Irrespective of the extent of purification, essentially no difference in the heat lability of DNA ligase I was detected among the four LCLs. These findings suggest that there may exist among BS LCLs at least two types of subtle abnormality of DNA ligase I itself and/or a putative substance modulating the enzyme function.

Keywords: Bloom's syndrome, DNA ligase I, Lymphoblastoid cell, Sister chromatid exchange

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