Identification and characterization of fructose-1, 6-diphosphate aldolase in seminal fluid of the silkworm, <i>Bombyx mori</i>

Identification and characterization of fructose-1, 6-diphosphate aldolase in seminal fluid of the silkworm, <i>Bombyx mori</i>
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家蚕精液中果糖1, 6-二磷酸醛缩酶的鉴定与表征

DOI:
10.11416/jibs.90.1_011
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发表时间:
2021
影响因子:
--
通讯作者:
M.
M.
中科院分区:
--
文献类型:
--
作者:
Nagaoka;S.;Tani;N.;Kimura;C. and Sakakura;M.

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果糖1,6 -二磷酸醛缩酶(EC 4.1)2.13。ALD是一种在高等生物细胞质中对糖酵解和糖异生起中心作用的酶。在家蚕中,该酶主要以组织特异性同聚体BmALD2 (s型)或BmALD1 (f型)的形式存在,分别主要存在于脂肪体和肌肉中。在本研究中,在雄性生殖系统的外分泌腺之一乳腺中检测到持续高水平的ALD活性,该活性在交配后无损地传播到雌性法氏囊交媾基质内形成的精囊。这种种子性ALD的总体动力学性质与先前研究的f型ALD相似。此外,逆转录-聚合酶链反应分析显示BmALD1在乳酸菌中主要表达。这些数据有力地表明,精液中含有f型ALD,它是BmALD1的同聚体,具有更高的总体酶活性,实现更高的细胞外糖酵解输出速率,并可以支持精子在精子包囊中的成熟。
Fructose 1, 6-bisphosphate aldolase (EC 4.1. 2.13.; ALD) is an enzyme that is central to glycolysis and gluconeogenesis in the cytoplasm of higher organisms. In the silkworm, Bombyx mori, this enzyme exists primarily in the form of tissue-specific homotetramers BmALD2 (type-S) or BmALD1 (type-F), mainly in the fat body and muscle, respectively. In the present study, a consistently high level of ALD activity was detected in the glandula (g.) lacteola, one of the exocrine glands of the male reproductive system, which was transmitted without loss upon mating to the spermatophore formed inside of the female bursa copulatrix. The overall kinetic properties of this seminal ALD are similar to those of the previously studied type-F. In addition, reverse transcription-polymerase chain reaction analysis showed that BmALD1 was predominantly expressed in the g. lacteola. These data strongly suggest that the seminal fluid contains type-F ALD, which is a homotetramer of BmALD1, which has higher overall enzymatic activity, achieves greater rates of extracellular glycolytic output, and can support sperm maturation in the spermatophore.
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