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glycosynth.co.uk westlakeploughparts.co.uk fallenfruits.co.uk 

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5-bromo-4-chloro-3-indolyl a -d-galactopyranoside {} x- a -gal is a chromogenic substrate which can be used to demonstrate a -galactosidase activity. glycosynth offers this product in high purity (>98%) at a competitive price. code product quantity price sterling price usd price euro 70039 x- a -gal 250mg £100 $205 €157 to place an order, please contact us by phone, fax or e-mail. alternatively, click here to use our on-line order form. to view our other high purity enzyme substrates, please visit our home page x- a -gal and the yeast two-hybrid screen the yeast two-hybrid screen is a genetic assay to detect protein-protein interactions in vivo. this method, developed by prof. stan fields and coworkers (1) can be used to investigate the interaction of two known proteins (e.g. defining domains or amino acids critical for interactions). another important application is the identification of previously unknown binding partners of specific proteins by screening a library. positive clones are selected by their ability to activate the transcription of reporter genes which enable the auxotrophic yeast two-hybrid strains to grow on nutritionally selective media. most two-hybrid methods also use the e. coli lacz gene as a second reporter gene. usually the colonies growing on the selection plates are assayed for the activation of the reporter gene lacz in a second screen by a time-consuming filter-lift assay. alternatively, in yeast strains producing a -galactosidase the chromogenic substrate x- a -gal can be used to assay gal4- based two-hybrid interactions directly on the nutritional selection plates (2). x- a -gal is a chromogenic substrate for a -galactosidase (also known as melibiase or alpha-d-galactoside galactohydrolase, ec 3.2.1.22), an enzyme which enables yeast to use the disaccharide melibiose as a carbon source during growth or fermentation. in the yeast saccharomyces cerevisiae this enzyme is encoded by the mel1 gene which is regulated by several gal genes. secretion of this enzyme in response to gal4 activation leads to hydrolysis of x- a -gal in the medium causing yeast colonies to develop a blue colour. a big advantage of this reporter system is that it abolishes the need for b -galactosidase filter-lift assays and the result can be seen immediately on the selection plates. yeast strains which can be used with include the strains ah109, pj69-2a, y190, and y187 sold by clontech for the "matchmaker yeast two-hybrid system " (matchmaker is a trademark of clontech laboratories, inc.). 1. s fields and o.-k. song, a novel genetic system to detect protein-protein interactions. nature, 340 , 245-246 (1989) 2. s. aho, a. arffman, t.pummi and j. uitto, a novel reporter gene mel1 for the yeast two-hybrid system. anal. biochem ., 253 , 270-272 (1997) how to make x- a -gal indicator plates to make x- a -gal indicator plates, x- a -gal can be either spread on top of the medium or included in the medium prior to pouring the plates. to spread x- a -gal onto pre-made plates: if using freshly poured plates, allow yeast dropout medium to cool down and harden at room temperature. spread 200-500 m l of x- a -gal stock solution (2 mg/ml in dmf) onto a 15-cm plate or 100-200 m l onto a 10-cm plate evenly. leave plates to dry at room temperature. plate cells and incubate at 30°c until blue colonies form. to pour x- a -gal indicator plates: autoclave the appropriate dropout agar medium. let it cool to 55°c before adding 1 ml of x- a -gal stock solution (20 mg/ml in dmf) per 1 litre medium. pour plates and allow medium to harden at room temperature. plate cells and incubate at 30°c until blue colonies form. stock solutions of x- a -gal should be stable for at least 6 months if kept in the dark at -20°c. references 1.) a colony-colour method which differentiates a -galactosidase positive strains of yeast. r.s. tubb and p.l. liljestrom, j. inst. brew. 92 , 588, (1986) 2.) histochemical detection of a -d-galactosidase with 5-br-4-cl-3-indoxyl a -d-galactoside r. gossrau and z. lojda, acta histochem., 85 , 213 (1989) 3.) x- a -gal-based medium for simultaneous enumeration of bifidobacteria and lactic acid bacteria in milk. p. chevalier, d. roy and and l. savoie, j.microbiol. meth., 13 , 75 (1991) 4.) american society of brewing chemists. report of subcommittee on x- a -gal medium. j. amer. soc. brew. chem., 51 , 185, (1993) copyright © glycosynth 2002 web design by j.c.s

URL analysis for x-alpha-gal.com

http://www.x-alpha-gal.com/contact.htm
glycosynth.co.uk

Whois Information

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Domain Name: X-ALPHA-GAL.COM
Registry Domain ID: 24888232_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.tucows.com
Registrar URL: http://www.tucowsdomains.com
Updated Date: 2017-04-03T08:26:08Z
Creation Date: 2000-04-13T21:33:08Z
Registry Expiry Date: 2018-04-13T21:33:08Z
Registrar: Tucows Domains Inc.
Registrar IANA ID: 69
Registrar Abuse Contact Email:
Registrar Abuse Contact Phone:
Domain Status: ok https://icann.org/epp#ok
Name Server: NS1.POSITIVE-INTERNET.COM
Name Server: NS2.POSITIVE-INTERNET.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2017-09-10T05:25:07Z <<<

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Registrars.

  REGISTRAR Tucows Domains Inc.

SERVERS

  SERVER com.whois-servers.net

  ARGS domain =x-alpha-gal.com

  PORT 43

  TYPE domain

DOMAIN

  NAME x-alpha-gal.com

  CHANGED 2017-04-03

  CREATED 2000-04-13

STATUS
ok https://icann.org/epp#ok

NSERVER

  NS1.POSITIVE-INTERNET.COM 80.87.136.65

  NS2.POSITIVE-INTERNET.COM 80.87.128.68

  REGISTERED yes

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