Colonic H-K-ATPase β-subunit: identification in apical membranes and regulation by dietary K depletion.
Colonic H-K-ATPase β-subunit: identification in apical membranes and regulation by dietary K depletion.
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结肠 H-K-ATP 酶 β 亚基:顶膜中的识别和饮食 K 消耗的调节。
DOI:
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发表时间:
1999
期刊:
影响因子:
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通讯作者:
H. Binder
中科院分区:
文献类型:
--
作者:
P. Sangan;S. Kolla;V. Rajendran;M. Kashgarian;H. Binder
P-type ATPases require both α- and β-subunits for functional activity. Although an α-subunit for colonic apical membrane H-K-ATPase (HKcα) has been identified and studied, its β-subunit has not been identified. We cloned putative β-subunit rat colonic H-K-ATPase (HKcβ) cDNA that encodes a 279-amino-acid protein with a single transmembrane domain and sequence homology to other rat β-subunits. Northern blot analysis demonstrates that this HKcβ is expressed in several rat tissues, including distal and proximal colon, and is highly expressed in testis and lung. HKcβ mRNA abundance is upregulated threefold compared with normal in distal colon but not proximal colon, testis, or lung of K-depleted rats. In contrast, Na-K-ATPase β1 mRNA abundance is unaltered in distal colon of K-depleted rats. Na depletion, which also stimulates active K absorption in distal colon, does not increase HKcβ mRNA abundance. Western blot analyses using a polyclonal antibody raised to a glutathione S-transferase-HKcβ fusion protein established expression of a 45-kDa HKcβ protein in both apical and basolateral membranes of rat distal colon, but K depletion increased HKcβ protein expression only in apical membranes. Physical association between HKcβ and HKcα proteins was demonstrated by Western blot analysis performed with HKcβ antibody on immunoprecipitate of apical membranes of rat distal colon and HKcα antibody. Tissue-specific upregulation of this β-subunit mRNA in response to K depletion, localization of its protein, its upregulation by K depletion in apical membranes of distal colon, and its physical association with HKcα protein provide compelling evidence that HKcβ is the putative β-subunit of colonic H-K-ATPase.
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DOI:
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发表时间:
1989
期刊:
The Journal of biological chemistry
影响因子:
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作者:
Martin-Vasallo,P;Dackowski,W;Emanuel,JR;Levenson,R
通讯作者:
Levenson,R
DOI:
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发表时间:
1989
期刊:
The Journal of biological chemistry
影响因子:
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作者:
Rajendran,VM;Kashgarian,M;Binder,HJ
通讯作者:
Binder,HJ
DOI:
10.1152/ajpcell.1993.265.4.c1080
发表时间:
1993
期刊:
The American journal of physiology
影响因子:
--
作者:
Jaisser,F;Coutry,N;Farman,N;Binder,HJ;Rossier,BC
通讯作者:
Rossier,BC
DOI:
10.1172/jci118247
发表时间:
1995
期刊:
The Journal of clinical investigation
影响因子:
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作者:
Lee,J;Rajendran,VM;Mann,AS;Kashgarian,M;Binder,HJ
通讯作者:
Binder,HJ
DOI:
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发表时间:
1990
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Lescale-Matys,L;Hensley,CB;Crnkovic-Markovic,R;Putnam,DS;McDonough,AA
通讯作者:
McDonough,AA