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129172-14-1

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129172-14-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 129172-14-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,1,7 and 2 respectively; the second part has 2 digits, 1 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 129172-14:
(8*1)+(7*2)+(6*9)+(5*1)+(4*7)+(3*2)+(2*1)+(1*4)=121
121 % 10 = 1
So 129172-14-1 is a valid CAS Registry Number.

129172-14-1Relevant articles and documents

Synthetic Peptidoglycan Substrates for Penicillin-Binding Protein 5 of Gram-Negative Bacteria

Hesek, Dusan,Suvorov, Maxim,Morio, Ken-Ichiro,Lee, Mijoon,Brown, Stephen,Vakulenko, Sergei B.,Mobashery, Shahriar

, p. 778 - 784 (2007/10/03)

The major constituent of the bacterial cell wall, peptidoglycan, is comprised of repeating units of N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) with an appended peptide. Penicillin-binding proteins (PBPs) are involved in the final stages of bacterial cell wall assembly. Two activities for PBPs are the cross-linking of the cell wall, carried out by DD-transpeptidases, and the DD-peptidase activity, that removes the terminal D-Ala residue from peptidoglycan. The DD-peptidase activity moderates the extent of the cell wall cross-linking. There exists a balance between the two activities that is critical for the well-being of bacterial cells. We have cloned and purified PBP5 of Escherichia coli. The membrane anchor of this protein was removed, and the enzyme was obtained as a soluble protein. Two fragments of the polymeric cell wall of Gram-negative bacteria (compounds 5 and 6) were synthesized. These molecules served as substrates for PBP5. The products of the reactions of PBP5 and compounds 5 and 6 were isolated and were shown to be D-Ala and the fragments of the substrates minus the terminal D-Ala. The kinetic parameters for these enzymic reactions were evaluated. PBP5 would appear to have the potential for turnover of as many as 1.4 million peptidoglycan strands within a single doubling time (i.e., generation) of E. coli.

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