Binds to type I collagen via alpha-2(I) or alpha-1(I) chains, although its affinity for the alpha-1(I) chain is significantly higher. Involved in bacterial adherence to transcutaneous drivelines from explanted ventricular assist devices. Each CNA-B domain is able to independently mediate adherence to the substrate. Belongs to the serine-aspartate repeat-containing protein (SDr) family.