= Alexander E. Aleshin
{c}
<Alexander E. Aleshin> is a researcher in <structural biology> credited with studies of the <complement system>. He was first author of the 2012 determination of the <crystal structure> of <complement C6>, with a Sanford-Burnham Medical Research Institute affiliation in the original byline.<Structure of complement C6 suggests a mechanism for initiation and unidirectional, sequential assembly of membrane attack complex (MAC) by Alexander E. Aleshin and others>[Author affiliations; Results, Overall Structure of C6]{ref}
The biological problem was how soluble <proteins> assemble a membrane-damaging machine. <Complement C6> is recruited during formation of the <membrane attack complex>. Its structure revealed a closed arrangement of <protein domains>. Comparing this arrangement with related components suggested how changes in domain orientation could help expose membrane-inserting regions and propagate assembly.<Structure of complement C6 suggests a mechanism for initiation and unidirectional, sequential assembly of membrane attack complex (MAC) by Alexander E. Aleshin and others>[Abstract; Results, C6 Adopts a Default Closed Autoinhibited State; Discussion]{ref}
A useful mechanical analogy is a folded tool whose working surface is inaccessible until a hinge opens. The analogy motivates two experimentally distinct questions: what configurations exist, and what causes transitions between them? Determining a <crystal structure> answers the first kind of question for the crystallized state; it does not directly film the assembly sequence.
The distinction is explicit in this work. The <complement C6> coordinates and comparisons constrain a proposed model of directional <membrane attack complex> assembly. Testing the proposed succession of movements requires additional evidence about interacting components and assembly intermediates. Aleshin and colleagues thus connected a measured molecular shape to a testable explanation of a larger biological process.<Structure of complement C6 suggests a mechanism for initiation and unidirectional, sequential assembly of membrane attack complex (MAC) by Alexander E. Aleshin and others>[Discussion, Model for MAC Initiation and Final Steps in MAC Assembly]{ref}
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