Preliminary crystallographic data for cross-linked (lysine7-lysine41)-ribonuclease A

A cross-linked derivative of ribonuclease A, N epsilon,N epsilon'-(2,4-dinitrophenylene-1,5)-lysine7-lysine41)- RNase A, has been crystallized by dialysis against 30% (v/v) ethanol/water mixtures buffered at high pH. Single crystals belong to the orthorhombic space group P212121, a = 37.2 A, b = 41.2 A, b = 41.2 A, with one molecule in the crystallographic asymmetric unit.