Inherited variations in human phosphohexose isomerase

Detter, James C.; Ways, Peter; Giblett, Eloise R.; Baughan, Marjorie A.; Hopkinson, D. A.; Povey, S.; Harris, Harry

doi:10.1111/j.1469-1809.1968.tb00565.x

Cited by 223 publications

(60 citation statements)

References 15 publications

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“…For dehydrogenase enzymes, one half of the gel was stained for 6-PGD and G-6PD by the method of Fildes and Parr (1963) and the other half was stained for lactate dehydrogenase (LDH) and malate dehydrogenase (MDH) as described by Kirk et al (1971). Phosphohexose isomerase (PHI) was performed by the method of Detter et al (1968).…”

Section: Methodsmentioning

confidence: 99%

Study of red cell enzyme systems in Tehran and Isfahan Iranians

1981

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Section: Methodsmentioning

confidence: 99%

Study of red cell enzyme systems in Tehran and Isfahan Iranians

1981

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“…Collection 4 ,umoles of glucose-6-P and 100 ,umoles of buffer in a total reaction volume of 1.0 ml. The formation of fructose-6-P was measured by the Roe method (14).…”

Section: Methodsmentioning

confidence: 99%

“…The quantity of the enzyme preparation added and the incubation time at 30 C were adjusted so that the final readings were between 0.2 and 0. 4 Figure 1 shows that the dialyzed homogenate from endosperms or embryos of developing seeds gives three peaks of GPI activity following chromatography on DEAE-cellulose. The activities from fractions 3 to 8, 10 to 14, and 17 to 24 are designated, respectively, as I, Ia, and II.…”

Section: Methodsmentioning

confidence: 99%

Multiple Forms of Glucosephosphate Isomerase in Maize

Salamini¹,

Tsai²,

Nelson³

1972

Plant Physiol.

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Three apparently different glucosephosphate isomerases are found in the developing seeds of maize (Zea mays L.). Glu umn chromatography of developing endosperm preparations. Activity under the Ia peak can be enhanced with a concomitant attenuation of activity under the I peak by certain purification procedures. I and II are, however, quite distinct noninterconvertible enzymes that may have different physiological functions. A third enzyme, GPI IIl, is detectable only in the embryo. This enzyme elutes from a DEAE-cellulose column in the same fractions as does GPl lI from the endosperm but is distinguishable from II on the basis of electrophoretic mobility and the stimulatory effect of ATP in the reaction mixtLire.These results contrast with those from pea and green gram (13,16), where highly purified enzymes have been prepared, but no heterogeneity has been reported. GPI from yeast has been crystallized (7). Recently, Nakagawa and Noltmann (8) fractionated the crystallized enzyme into three isozymic forms by elution with a very shallow phosphate gradient from a DEAE-cellulose column. These are stable protein species that are not interconvertible under physiological conditions (9). In contrast to this, Pon et al. (11) have shown that multiple forms of rabbit muscle GPI separated by column chromatography do not remain as single species during rechromatography under the same conditions, although the addition of dithiothreitol prevents previously separated single peaks from separating further. These forms of rabbit muscle isomerases are apparently different forms of the same enzyme protein and can be designated as "pseudoisozvmes." We demonstrate here that both situations are found in developing maize seeds. There are multiple forms that are separable by column chromatography and distinguishable by various tests. Additionally, GPI I can generate a number of electrophoretically separable pseudoisozymes under certain preparative regimens.Since we are interested in the regulation of starch synthesis in maize, glucosephosphate isomerase activity in the maize seed has been investigated. The results reveal that three peaks of activity (I, Ia, II) can be detected after DEAE5-cellulose col-

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“…In the present study four examples of the PHI 3-1 combination were detected, all the other persons being PHI 1-1. Detter et al (1968) first described PHI 3-1 phenotypes among Indians living in England, and Blake et al (1972) have also found just over 1% PHI 3-1 persons in a large series from north India. The finding of a similar frequency among Lebanese in the present study suggests that the PHP allele is widely distributed in the Middle East.…”

Section: Red Cell Enzyme Groupsmentioning

confidence: 98%

The Distribution of Blood, Serum Protein and Enzyme Groups in a Series of Lebanese in Australia

Blake¹,

Rl²,

McDermid³

et al. 1973

Aust J Exp Biol Med

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Summary Blood samples from a series of persons of Lebanese origin living in Sydney have been tested for 9 blood group, 5 serum protein and 16 red cell enzyme systems as well as haemoglobin types. The Lutheran, Kidd and Colton blood group systems and all the serum protein and enzyme group systems reported on here, except haptoglobin and glucose‐6‐phosphate dehydrogenase, have not been studied previously in Lebanese. There were no cases of glucose‐6‐phosphate dehydrogenase deficiency or abnormal haemoglobins nor were any unusual phenotypes detected in the other 29 systems investigated. In the blood group systems there was a relatively high A1/A2 ratio and low frequencies for the Rh ‐ve and Co(b+) phenotypes, but frequencies in the other systems were comparable with values found in studies of other Middle East or European populations. In the Kell system the possibility exists that the Lebanese may have an appreciable frequency of (K‐k‐). Gene frequencies for die serum protein systems were similar to other Middle East populations where comparable figures are available, and the same is true for the red cell enzyme systems. For glucose‐6‐phosphate dehydrogenase and phosphohexose isomerase, values obtained suggest that frequencies in north India are similar to those in Lebanon. The overall results are discussed in relation to selection in a migrant population.

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Inherited variations in human phosphohexose isomerase

Cited by 223 publications

References 15 publications

Study of red cell enzyme systems in Tehran and Isfahan Iranians

Study of red cell enzyme systems in Tehran and Isfahan Iranians

Multiple Forms of Glucosephosphate Isomerase in Maize

The Distribution of Blood, Serum Protein and Enzyme Groups in a Series of Lebanese in Australia

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