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Table 1 Trypanosomal Targets, Their Human Equivalents, and Current Leads for <strong>Drug</strong> <strong>Design</strong><br />

T. brucei Human host Lead<br />

RNA editing <strong>by</strong> trans-splicing [11] cis-splicing none<br />

All energy from fast glycolysis [12] glycolysis and oxidative<br />

phosphorylation<br />

Glucose transporter [14] human erythrocyte glucose<br />

transporter<br />

Purine P2 transporter [15] none<br />

Purine salvage enzymes, e.g., HGPRT b [16] HGPRT none<br />

Slow rate of enzyme turnover [17], e.g., ornithine<br />

decarboxylase [18]<br />

Polyamine metabolism, e.g., S-adenosyl<br />

methionine decarboxylase [19]<br />

MMBA a [13]<br />

none<br />

Page 368<br />

fast rate of enzyme turnover eflornithine (= drug) [9]<br />

S-adenosyl methionine<br />

decarboxylase<br />

MDL 73811 c<br />

Trypanothione reductase [20] glutathione reductase mepacrine<br />

VSG anchor: a myristate-containing GPI [21] 10-(propoxy)-decanoate d<br />

a MMBA = 2' -deoxy-2' -(m-methoxybenzamido)-adenosine.<br />

b HGPRT = hypoxanthine guanine phosphoribosyltransferase.<br />

c MDL 73811 = 5' -{[(Z)-4-amino-2-butenyl]methylamino}-5' -deoxyadenosine.<br />

dIt has not been established whether the trypanocidal effect of this compound is due to its incorporation in the GPI anchor<br />

[5].<br />

known. For five more targets the crystal structure of only the mammalian enzyme is available. Efforts to<br />

solve the structures of trypanosmatid aldolase, PGK, and PK counterparts are underway in our lab. This<br />

review explains how we attempted to arrive at selective inhibitors of three trypanosomal glycolytic<br />

enzymes.<br />

C. Trypanosomal Glycolysis: Enzyme Inhibition as a Target<br />

In the bloodstream of the human host, trypanosomes are metabolically<br />

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